[PATCH v3 0/5] xl: convert exit codes to EXIT_[SUCCESS|FAILURE]

[PATCH v3 0/5] xl: convert exit codes to EXIT_[SUCCESS|FAILURE]

[Harmandeep Kaur]

*Its my "bite size contribution" that is required for applying to the
Outreachy program.

*main_foo() is treated somewhat as a regular main(), it is changed to
return EXIT_SUCCESS or EXIT_FAILURE.

*Functions that are not main_foo(), are changed to do 'return 0' or
'return 1', and then 0/1 is taken care in the main_foo() functions
that calls them.

*Functions in xl.c and xl_cmdimpl.c are changed.

*Functions related to scheduling, vcpu, cpupool and parsing are
currently changed excluding parse_config_data() which is big enough
to deserve its own patch.

*Some discussions about this patch:
https://www.mail-archive.com/xen-devel@lists.xen.org/msg42850.html

*v1 of this patch:
http://lists.xenproject.org/archives/html/xen-devel/2015-10/msg02497.html

*v2 of this patch:
http://lists.xenproject.org/archives/html/xen-devel/2015-10/msg02623.html

Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
---

[PATCH v3 1/5] xl: convert main() exit codes to EXIT_[SUCCESS|FAILURE]

[Harmandeep Kaur]

Turning main() function exit codes towards using the EXIT_[SUCCESS|FAILURE]
constants, instead of instead of arbitrary numbers or libxl return codes.

Also includes a document comment in xl.h stating xl process should always
return EXIT_FOO and main_* can be treated as main() as if they are returning
a process exit status and not a function return value)

Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
---
v2->v3: Commented more precisely and aligned comment properly.
v1->v2: Applied new approach (main() functions return 
	EXIT_SUCCESS/FAILURE and other functions return 0/1).

 tools/libxl/xl.c | 12 ++++++------
 tools/libxl/xl.h |  7 +++++++
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/tools/libxl/xl.c b/tools/libxl/xl.c
index 5316ad9..dfae84a 100644
--- a/tools/libxl/xl.c
+++ b/tools/libxl/xl.c
@@ -318,7 +318,7 @@ int main(int argc, char **argv)
             break;
         default:
             fprintf(stderr, "unknown global option\n");
-            exit(2);
+            exit(EXIT_FAILURE);
         }
     }
 
@@ -326,13 +326,13 @@ int main(int argc, char **argv)
 
     if (!cmd) {
         help(NULL);
-        exit(1);
+        exit(EXIT_FAILURE);
     }
     opterr = 0;
 
     logger = xtl_createlogger_stdiostream(stderr, minmsglevel,
         (progress_use_cr ? XTL_STDIOSTREAM_PROGRESS_USE_CR : 0));
-    if (!logger) exit(1);
+    if (!logger) exit(EXIT_FAILURE);
 
     atexit(xl_ctx_free);
 
@@ -355,16 +355,16 @@ int main(int argc, char **argv)
     if (cspec) {
         if (dryrun_only && !cspec->can_dryrun) {
             fprintf(stderr, "command does not implement -N (dryrun) option\n");
-            ret = 1;
+            ret = EXIT_FAILURE;
             goto xit;
         }
         ret = cspec->cmd_impl(argc, argv);
     } else if (!strcmp(cmd, "help")) {
         help(argv[1]);
-        ret = 0;
+        ret = EXIT_SUCCESS;
     } else {
         fprintf(stderr, "command not implemented\n");
-        ret = 1;
+        ret = EXIT_FAILURE;
     }
 
  xit:
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index 0021112..c6fb1da 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -30,6 +30,13 @@ struct cmd_spec {
     char *cmd_option;
 };
 
+/*
+ *The xl process should always return either EXIT_SUCCESS or
+ *EXIT_FAILURE. main_* functions, implementing the various xl
+ *commands, can be treated as main() as if they are returning
+ *a process exit status and not a function return value.
+ */
+
 int main_vcpulist(int argc, char **argv);
 int main_info(int argc, char **argv);
 int main_sharing(int argc, char **argv);
-- 
1.9.1

[PATCH v3 2/5] xl: improve return and exit codes of scheduling related functions

[Harmandeep Kaur]

Turning scheduling related functions exit codes towards using the
EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary numbers
or libxl return codes.
	- for main_*: arbitrary -> EXIT_SUCCESS|EXIT_FAILURE.
	- for internal fucntion: arbitrary -> 0/1.

Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
---
v2->v3: Reverted removal of 'rc' in sched_domain_output().

 tools/libxl/xl_cmdimpl.c | 139 +++++++++++++++++++++++------------------------
 1 file changed, 67 insertions(+), 72 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 646b281..b101aff 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5793,18 +5793,15 @@ int main_sharing(int argc, char **argv)
 static int sched_domain_get(libxl_scheduler sched, int domid,
                             libxl_domain_sched_params *scinfo)
 {
-    int rc;
-
-    rc = libxl_domain_sched_params_get(ctx, domid, scinfo);
-    if (rc) {
+    if (libxl_domain_sched_params_get(ctx, domid, scinfo)){
         fprintf(stderr, "libxl_domain_sched_params_get failed.\n");
-        return rc;
+        return 1;
     }
     if (scinfo->sched != sched) {
         fprintf(stderr, "libxl_domain_sched_params_get returned %s not %s.\n",
                 libxl_scheduler_to_string(scinfo->sched),
                 libxl_scheduler_to_string(sched));
-        return ERROR_INVAL;
+        return 1;
     }
 
     return 0;
@@ -5812,42 +5809,38 @@ static int sched_domain_get(libxl_scheduler sched, int domid,
 
 static int sched_domain_set(int domid, const libxl_domain_sched_params *scinfo)
 {
-    int rc;
-
-    rc = libxl_domain_sched_params_set(ctx, domid, scinfo);
-    if (rc)
+    if (libxl_domain_sched_params_set(ctx, domid, scinfo)){
         fprintf(stderr, "libxl_domain_sched_params_set failed.\n");
+        return 1;
+    }
 
-    return rc;
+    return 0;
 }
 
 static int sched_credit_params_set(int poolid, libxl_sched_credit_params *scinfo)
 {
-    int rc;
-
-    rc = libxl_sched_credit_params_set(ctx, poolid, scinfo);
-    if (rc)
+    if (libxl_sched_credit_params_set(ctx, poolid, scinfo)){
         fprintf(stderr, "libxl_sched_credit_params_set failed.\n");
+        return 1;
+    }
 
-    return rc;
+    return 0;
 }
 
 static int sched_credit_params_get(int poolid, libxl_sched_credit_params *scinfo)
 {
-    int rc;
-
-    rc = libxl_sched_credit_params_get(ctx, poolid, scinfo);
-    if (rc)
+    if (libxl_sched_credit_params_get(ctx, poolid, scinfo)){
         fprintf(stderr, "libxl_sched_credit_params_get failed.\n");
+        return 1;
+    }
 
-    return rc;
+    return 0;
 }
 
 static int sched_credit_domain_output(int domid)
 {
     char *domname;
     libxl_domain_sched_params scinfo;
-    int rc;
 
     if (domid < 0) {
         printf("%-33s %4s %6s %4s\n", "Name", "ID", "Weight", "Cap");
@@ -5855,9 +5848,10 @@ static int sched_credit_domain_output(int domid)
     }
 
     libxl_domain_sched_params_init(&scinfo);
-    rc = sched_domain_get(LIBXL_SCHEDULER_CREDIT, domid, &scinfo);
-    if (rc)
-        return rc;
+    if (sched_domain_get(LIBXL_SCHEDULER_CREDIT, domid, &scinfo)){
+        libxl_domain_sched_params_dispose(&scinfo);
+        return 1;
+    }
     domname = libxl_domid_to_name(ctx, domid);
     printf("%-33s %4d %6d %4d\n",
         domname,
@@ -5873,11 +5867,9 @@ static int sched_credit_pool_output(uint32_t poolid)
 {
     libxl_sched_credit_params scparam;
     char *poolname;
-    int rc;
 
     poolname = libxl_cpupoolid_to_name(ctx, poolid);
-    rc = sched_credit_params_get(poolid, &scparam);
-    if (rc) {
+    if (sched_credit_params_get(poolid, &scparam)){
         printf("Cpupool %s: [sched params unavailable]\n",
                poolname);
     } else {
@@ -5895,7 +5887,6 @@ static int sched_credit2_domain_output(
 {
     char *domname;
     libxl_domain_sched_params scinfo;
-    int rc;
 
     if (domid < 0) {
         printf("%-33s %4s %6s\n", "Name", "ID", "Weight");
@@ -5903,9 +5894,10 @@ static int sched_credit2_domain_output(
     }
 
     libxl_domain_sched_params_init(&scinfo);
-    rc = sched_domain_get(LIBXL_SCHEDULER_CREDIT2, domid, &scinfo);
-    if (rc)
-        return rc;
+    if (sched_domain_get(LIBXL_SCHEDULER_CREDIT2, domid, &scinfo)){
+        libxl_domain_sched_params_dispose(&scinfo);
+        return 1;
+    }
     domname = libxl_domid_to_name(ctx, domid);
     printf("%-33s %4d %6d\n",
         domname,
@@ -5921,7 +5913,6 @@ static int sched_rtds_domain_output(
 {
     char *domname;
     libxl_domain_sched_params scinfo;
-    int rc = 0;
 
     if (domid < 0) {
         printf("%-33s %4s %9s %9s\n", "Name", "ID", "Period", "Budget");
@@ -5929,9 +5920,10 @@ static int sched_rtds_domain_output(
     }
 
     libxl_domain_sched_params_init(&scinfo);
-    rc = sched_domain_get(LIBXL_SCHEDULER_RTDS, domid, &scinfo);
-    if (rc)
-        goto out;
+    if (sched_domain_get(LIBXL_SCHEDULER_RTDS, domid, &scinfo)){
+        libxl_domain_sched_params_dispose(&scinfo);
+        return 1;
+    }
 
     domname = libxl_domid_to_name(ctx, domid);
     printf("%-33s %4d %9d %9d\n",
@@ -5940,10 +5932,8 @@ static int sched_rtds_domain_output(
         scinfo.period,
         scinfo.budget);
     free(domname);
-
-out:
     libxl_domain_sched_params_dispose(&scinfo);
-    return rc;
+    return 0;
 }
 
 static int sched_rtds_pool_output(uint32_t poolid)
@@ -5981,7 +5971,7 @@ static int sched_domain_output(libxl_scheduler sched, int (*output)(int),
         if (libxl_cpupool_qualifier_to_cpupoolid(ctx, cpupool, &poolid, NULL) ||
             !libxl_cpupoolid_is_valid(ctx, poolid)) {
             fprintf(stderr, "unknown cpupool \'%s\'\n", cpupool);
-            return -ERROR_FAIL;
+            return 1;
         }
     }
 
@@ -5994,7 +5984,7 @@ static int sched_domain_output(libxl_scheduler sched, int (*output)(int),
     if (!poolinfo) {
         fprintf(stderr, "error getting cpupool info\n");
         libxl_dominfo_list_free(info, nb_domain);
-        return -ERROR_NOMEM;
+        return 1;
     }
 
     for (p = 0; !rc && (p < n_pools); p++) {
@@ -6080,16 +6070,16 @@ int main_sched_credit(int argc, char **argv)
     if ((cpupool || opt_s) && (dom || opt_w || opt_c)) {
         fprintf(stderr, "Specifying a cpupool or schedparam is not "
                 "allowed with domain options.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
     if (!dom && (opt_w || opt_c)) {
         fprintf(stderr, "Must specify a domain.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
     if (!opt_s && (opt_t || opt_r)) {
         fprintf(stderr, "Must specify schedparam to set schedule "
                 "parameter values.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (opt_s) {
@@ -6101,16 +6091,16 @@ int main_sched_credit(int argc, char **argv)
                                                      &poolid, NULL) ||
                 !libxl_cpupoolid_is_valid(ctx, poolid)) {
                 fprintf(stderr, "unknown cpupool \'%s\'\n", cpupool);
-                return -ERROR_FAIL;
+                return EXIT_FAILURE;
             }
         }
 
         if (!opt_t && !opt_r) { /* Output scheduling parameters */
-            return -sched_credit_pool_output(poolid);
+            if (sched_credit_pool_output(poolid))
+                return EXIT_FAILURE;
         } else { /* Set scheduling parameters*/
-            rc = sched_credit_params_get(poolid, &scparam);
-            if (rc)
-                return -rc;
+            if (sched_credit_params_get(poolid, &scparam))
+                return EXIT_FAILURE;
 
             if (opt_t)
                 scparam.tslice_ms = tslice;
@@ -6118,21 +6108,22 @@ int main_sched_credit(int argc, char **argv)
             if (opt_r)
                 scparam.ratelimit_us = ratelimit;
 
-            rc = sched_credit_params_set(poolid, &scparam);
-            if (rc)
-                return -rc;
+            if (sched_credit_params_set(poolid, &scparam))
+                return EXIT_FAILURE;
         }
     } else if (!dom) { /* list all domain's credit scheduler info */
-        return -sched_domain_output(LIBXL_SCHEDULER_CREDIT,
+        if (sched_domain_output(LIBXL_SCHEDULER_CREDIT,
                                     sched_credit_domain_output,
                                     sched_credit_pool_output,
-                                    cpupool);
+                                    cpupool))
+            return EXIT_FAILURE;
     } else {
         uint32_t domid = find_domain(dom);
 
         if (!opt_w && !opt_c) { /* output credit scheduler info */
             sched_credit_domain_output(-1);
-            return -sched_credit_domain_output(domid);
+            if (sched_credit_domain_output(domid))
+                return EXIT_FAILURE;
         } else { /* set credit scheduler paramaters */
             libxl_domain_sched_params scinfo;
             libxl_domain_sched_params_init(&scinfo);
@@ -6144,11 +6135,11 @@ int main_sched_credit(int argc, char **argv)
             rc = sched_domain_set(domid, &scinfo);
             libxl_domain_sched_params_dispose(&scinfo);
             if (rc)
-                return -rc;
+                return EXIT_FAILURE;
         }
     }
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_sched_credit2(int argc, char **argv)
@@ -6180,24 +6171,26 @@ int main_sched_credit2(int argc, char **argv)
     if (cpupool && (dom || opt_w)) {
         fprintf(stderr, "Specifying a cpupool is not allowed with other "
                 "options.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
     if (!dom && opt_w) {
         fprintf(stderr, "Must specify a domain.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (!dom) { /* list all domain's credit scheduler info */
-        return -sched_domain_output(LIBXL_SCHEDULER_CREDIT2,
+        if (sched_domain_output(LIBXL_SCHEDULER_CREDIT2,
                                     sched_credit2_domain_output,
                                     sched_default_pool_output,
-                                    cpupool);
+                                    cpupool))
+            return EXIT_FAILURE;
     } else {
         uint32_t domid = find_domain(dom);
 
         if (!opt_w) { /* output credit2 scheduler info */
             sched_credit2_domain_output(-1);
-            return -sched_credit2_domain_output(domid);
+            if (sched_credit2_domain_output(domid))
+                return EXIT_FAILURE;
         } else { /* set credit2 scheduler paramaters */
             libxl_domain_sched_params scinfo;
             libxl_domain_sched_params_init(&scinfo);
@@ -6207,11 +6200,11 @@ int main_sched_credit2(int argc, char **argv)
             rc = sched_domain_set(domid, &scinfo);
             libxl_domain_sched_params_dispose(&scinfo);
             if (rc)
-                return -rc;
+                return EXIT_FAILURE;
         }
     }
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 /*
@@ -6256,27 +6249,29 @@ int main_sched_rtds(int argc, char **argv)
     if (cpupool && (dom || opt_p || opt_b)) {
         fprintf(stderr, "Specifying a cpupool is not allowed with "
                 "other options.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
     if (!dom && (opt_p || opt_b)) {
         fprintf(stderr, "Must specify a domain.\n");
-        return 1;
+        return EXIT_FAILURE;
     }
     if (opt_p != opt_b) {
         fprintf(stderr, "Must specify period and budget\n");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (!dom) { /* list all domain's rt scheduler info */
-        return -sched_domain_output(LIBXL_SCHEDULER_RTDS,
+        if (sched_domain_output(LIBXL_SCHEDULER_RTDS,
                                     sched_rtds_domain_output,
                                     sched_rtds_pool_output,
-                                    cpupool);
+                                    cpupool))
+            return EXIT_FAILURE;
     } else {
         uint32_t domid = find_domain(dom);
         if (!opt_p && !opt_b) { /* output rt scheduler info */
             sched_rtds_domain_output(-1);
-            return -sched_rtds_domain_output(domid);
+            if (sched_rtds_domain_output(domid))
+                return EXIT_FAILURE;
         } else { /* set rt scheduler paramaters */
             libxl_domain_sched_params scinfo;
             libxl_domain_sched_params_init(&scinfo);
@@ -6287,11 +6282,11 @@ int main_sched_rtds(int argc, char **argv)
             rc = sched_domain_set(domid, &scinfo);
             libxl_domain_sched_params_dispose(&scinfo);
             if (rc)
-                return -rc;
+                return EXIT_FAILURE;
         }
     }
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_domid(int argc, char **argv)
-- 
1.9.1

[PATCH v3 3/5] xl: improve return and exit codes of vcpu related functions

[Harmandeep Kaur]

Turning vcpu manipulation functions exit codes toward using the
EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary numbers
or libxl return codes.

Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
---
v2->v3: Fixed return of main_vcpuset.

 tools/libxl/xl_cmdimpl.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index b101aff..1dae28f 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -5316,7 +5316,7 @@ int main_vcpulist(int argc, char **argv)
     }
 
     vcpulist(argc - optind, argv + optind);
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_vcpupin(int argc, char **argv)
@@ -5332,7 +5332,7 @@ int main_vcpupin(int argc, char **argv)
     long vcpuid;
     const char *vcpu, *hard_str, *soft_str;
     char *endptr;
-    int opt, nb_cpu, nb_vcpu, rc = -1;
+    int opt, nb_cpu, nb_vcpu, rc = EXIT_FAILURE;
 
     libxl_bitmap_init(&cpumap_hard);
     libxl_bitmap_init(&cpumap_soft);
@@ -5407,10 +5407,10 @@ int main_vcpupin(int argc, char **argv)
 
         if (ferror(stdout) || fflush(stdout)) {
             perror("stdout");
-            exit(-1);
+            exit(EXIT_FAILURE);
         }
 
-        rc = 0;
+        rc = EXIT_SUCCESS;
         goto out;
     }
 
@@ -5430,7 +5430,7 @@ int main_vcpupin(int argc, char **argv)
         libxl_vcpuinfo_list_free(vcpuinfo, nb_vcpu);
     }
 
-    rc = 0;
+    rc = EXIT_SUCCESS;
  out:
     libxl_bitmap_dispose(&cpumap_soft);
     libxl_bitmap_dispose(&cpumap_hard);
@@ -5459,8 +5459,7 @@ static int vcpuset(uint32_t domid, const char* nr_vcpus, int check_host)
         unsigned int host_cpu = libxl_get_max_cpus(ctx);
         libxl_dominfo dominfo;
 
-        rc = libxl_domain_info(ctx, &dominfo, domid);
-        if (rc)
+        if (libxl_domain_info(ctx, &dominfo, domid))
             return 1;
 
         if (max_vcpus > dominfo.vcpu_online && max_vcpus > host_cpu) {
@@ -5473,8 +5472,7 @@ static int vcpuset(uint32_t domid, const char* nr_vcpus, int check_host)
         if (rc)
             return 1;
     }
-    rc = libxl_cpu_bitmap_alloc(ctx, &cpumap, max_vcpus);
-    if (rc) {
+    if (libxl_cpu_bitmap_alloc(ctx, &cpumap, max_vcpus)){
         fprintf(stderr, "libxl_cpu_bitmap_alloc failed, rc: %d\n", rc);
         return 1;
     }
@@ -5508,7 +5506,10 @@ int main_vcpuset(int argc, char **argv)
         break;
     }
 
-    return vcpuset(find_domain(argv[optind]), argv[optind + 1], check_host);
+    if (vcpuset(find_domain(argv[optind]), argv[optind + 1], check_host))
+        return EXIT_FAILURE;
+
+    return EXIT_SUCCESS;
 }
 
 static void output_xeninfo(void)
-- 
1.9.1

[PATCH v3 4/5] xl: improve return and exit codes of cpupool related functions

[Harmandeep Kaur]

Turning  cpupools related functions exit codes towards using the
EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary numbers
or libxl return codes.

Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
---
v2->v3: Edited changelog.

 tools/libxl/xl_cmdimpl.c | 52 ++++++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 1dae28f..76d9af6 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -7314,7 +7314,7 @@ int main_cpupoolcreate(int argc, char **argv)
     libxl_bitmap cpumap;
     libxl_uuid uuid;
     libxl_cputopology *topology;
-    int rc = 1;
+    int rc = EXIT_FAILURE;
 
     SWITCH_FOREACH_OPT(opt, "nf:", opts, "cpupool-create", 0) {
     case 'f':
@@ -7484,7 +7484,7 @@ int main_cpupoolcreate(int argc, char **argv)
         }
     }
     /* We made it! */
-    rc = 0;
+    rc = EXIT_SUCCESS;
    
 out_cfg:
     xlu_cfg_destroy(config);
@@ -7521,14 +7521,14 @@ int main_cpupoollist(int argc, char **argv)
         pool = argv[optind];
         if (libxl_name_to_cpupoolid(ctx, pool, &poolid)) {
             fprintf(stderr, "Pool \'%s\' does not exist\n", pool);
-            return 1;
+            return EXIT_FAILURE;
         }
     }
 
     poolinfo = libxl_list_cpupool(ctx, &n_pools);
     if (!poolinfo) {
         fprintf(stderr, "error getting cpupool info\n");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     printf("%-19s", "Name");
@@ -7559,7 +7559,7 @@ int main_cpupoollist(int argc, char **argv)
 
     libxl_cpupoolinfo_list_free(poolinfo, n_pools);
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_cpupooldestroy(int argc, char **argv)
@@ -7577,13 +7577,13 @@ int main_cpupooldestroy(int argc, char **argv)
     if (libxl_cpupool_qualifier_to_cpupoolid(ctx, pool, &poolid, NULL) ||
         !libxl_cpupoolid_is_valid(ctx, poolid)) {
         fprintf(stderr, "unknown cpupool '%s'\n", pool);
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (libxl_cpupool_destroy(ctx, poolid))
-        return 1;
+        return EXIT_FAILURE;
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_cpupoolrename(int argc, char **argv)
@@ -7602,17 +7602,17 @@ int main_cpupoolrename(int argc, char **argv)
     if (libxl_cpupool_qualifier_to_cpupoolid(ctx, pool, &poolid, NULL) ||
         !libxl_cpupoolid_is_valid(ctx, poolid)) {
         fprintf(stderr, "unknown cpupool '%s'\n", pool);
-        return 1;
+        return EXIT_FAILURE;
     }
 
     new_name = argv[optind];
 
     if (libxl_cpupool_rename(ctx, new_name, poolid)) {
         fprintf(stderr, "Can't rename cpupool '%s'\n", pool);
-        return 1;
+        return EXIT_FAILURE;
     }
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_cpupoolcpuadd(int argc, char **argv)
@@ -7621,7 +7621,7 @@ int main_cpupoolcpuadd(int argc, char **argv)
     const char *pool;
     uint32_t poolid;
     libxl_bitmap cpumap;
-    int rc = 1;
+    int rc = EXIT_FAILURE;
 
     SWITCH_FOREACH_OPT(opt, "", NULL, "cpupool-cpu-add", 2) {
         /* No options */
@@ -7630,7 +7630,7 @@ int main_cpupoolcpuadd(int argc, char **argv)
     libxl_bitmap_init(&cpumap);
     if (libxl_cpu_bitmap_alloc(ctx, &cpumap, 0)) {
         fprintf(stderr, "Unable to allocate cpumap");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     pool = argv[optind++];
@@ -7646,7 +7646,7 @@ int main_cpupoolcpuadd(int argc, char **argv)
     if (libxl_cpupool_cpuadd_cpumap(ctx, poolid, &cpumap))
         fprintf(stderr, "some cpus may not have been added to %s\n", pool);
 
-    rc = 0;
+    rc = EXIT_SUCCESS;
 
 out:
     libxl_bitmap_dispose(&cpumap);
@@ -7659,12 +7659,12 @@ int main_cpupoolcpuremove(int argc, char **argv)
     const char *pool;
     uint32_t poolid;
     libxl_bitmap cpumap;
-    int rc = 1;
+    int rc = EXIT_FAILURE;
 
     libxl_bitmap_init(&cpumap);
     if (libxl_cpu_bitmap_alloc(ctx, &cpumap, 0)) {
         fprintf(stderr, "Unable to allocate cpumap");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     SWITCH_FOREACH_OPT(opt, "", NULL, "cpupool-cpu-remove", 2) {
@@ -7684,7 +7684,7 @@ int main_cpupoolcpuremove(int argc, char **argv)
     if (libxl_cpupool_cpuremove_cpumap(ctx, poolid, &cpumap))
         fprintf(stderr, "some cpus may not have been removed from %s\n", pool);
 
-    rc = 0;
+    rc = EXIT_SUCCESS;
 
 out:
     libxl_bitmap_dispose(&cpumap);
@@ -7709,19 +7709,19 @@ int main_cpupoolmigrate(int argc, char **argv)
     if (libxl_domain_qualifier_to_domid(ctx, dom, &domid) ||
         !libxl_domid_to_name(ctx, domid)) {
         fprintf(stderr, "unknown domain '%s'\n", dom);
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (libxl_cpupool_qualifier_to_cpupoolid(ctx, pool, &poolid, NULL) ||
         !libxl_cpupoolid_is_valid(ctx, poolid)) {
         fprintf(stderr, "unknown cpupool '%s'\n", pool);
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (libxl_cpupool_movedomain(ctx, poolid, domid))
-        return 1;
+        return EXIT_FAILURE;
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 int main_cpupoolnumasplit(int argc, char **argv)
@@ -7749,13 +7749,13 @@ int main_cpupoolnumasplit(int argc, char **argv)
 
     libxl_dominfo_init(&info);
 
-    rc = 1;
+    rc = EXIT_FAILURE;
 
     libxl_bitmap_init(&cpumap);
     poolinfo = libxl_list_cpupool(ctx, &n_pools);
     if (!poolinfo) {
         fprintf(stderr, "error getting cpupool info\n");
-        return 1;
+        return EXIT_FAILURE;
     }
     poolid = poolinfo[0].poolid;
     sched = poolinfo[0].sched;
@@ -7763,13 +7763,13 @@ int main_cpupoolnumasplit(int argc, char **argv)
 
     if (n_pools > 1) {
         fprintf(stderr, "splitting not possible, already cpupools in use\n");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     topology = libxl_get_cpu_topology(ctx, &n_cpus);
     if (topology == NULL) {
         fprintf(stderr, "libxl_get_topologyinfo failed\n");
-        return 1;
+        return EXIT_FAILURE;
     }
 
     if (libxl_cpu_bitmap_alloc(ctx, &cpumap, 0)) {
@@ -7858,7 +7858,7 @@ int main_cpupoolnumasplit(int argc, char **argv)
         }
     }
 
-    rc = 0;
+    rc = EXIT_SUCCESS;
 
 out:
     libxl_cputopology_list_free(topology, n_cpus);
-- 
1.9.1

[PATCH v3 5/5] xl: improve return and exit codes of parse related functions

[Harmandeep Kaur]

Turning  parsing related functions exit codes towards using the
EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary numbers
or libxl return codes.
	- for main_*: arbitrary -> EXIT_SUCCESS|EXIT_FAILURE.
	- for internal fucntion: arbitrary -> 0/1.

Don't touch parse_config_data() which is big enough to deserve its own patch.

Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
---
v2->v3: Reverted return of parse_mem_size_kb() to -1.
	And exculded out of scope changes.

 tools/libxl/xl_cmdimpl.c | 51 ++++++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 76d9af6..1ddf144 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -578,10 +578,10 @@ static void parse_disk_config_multistring(XLU_Config **config,
     }
 
     e = xlu_disk_parse(*config, nspecs, specs, disk);
-    if (e == EINVAL) exit(-1);
+    if (e == EINVAL) exit(EXIT_FAILURE);
     if (e) {
         fprintf(stderr,"xlu_disk_parse failed: %s\n",strerror(errno));
-        exit(-1);
+        exit(EXIT_FAILURE);
     }
 }
 
@@ -597,10 +597,10 @@ static void parse_vif_rate(XLU_Config **config, const char *rate,
     int e;
 
     e = xlu_vif_parse_rate(*config, rate, nic);
-    if (e == EINVAL || e == EOVERFLOW) exit(-1);
+    if (e == EINVAL || e == EOVERFLOW) exit(EXIT_FAILURE);
     if (e) {
         fprintf(stderr,"xlu_vif_parse_rate failed: %s\n",strerror(errno));
-        exit(-1);
+        exit(EXIT_FAILURE);
     }
 }
 
@@ -741,19 +741,19 @@ static int parse_range(const char *str, unsigned long *a, unsigned long *b)
 
     *a = *b = strtoul(str, &endptr, 10);
     if (endptr == str || *a == ULONG_MAX)
-        return ERROR_INVAL;
+        return 1;
 
     if (*endptr == '-') {
         nstr = endptr + 1;
 
         *b = strtoul(nstr, &endptr, 10);
         if (endptr == nstr || *b == ULONG_MAX || *b < *a)
-            return ERROR_INVAL;
+            return 1;
     }
 
     /* Valid value or range so far, but we also don't want junk after that */
     if (*endptr != '\0')
-        return ERROR_INVAL;
+        return 1;
 
     return 0;
 }
@@ -902,7 +902,7 @@ static char *parse_cmdline(XLU_Config *config)
 
     if ((buf || root || extra) && !cmdline) {
         fprintf(stderr, "Failed to allocate memory for cmdline\n");
-        exit(1);
+        exit(EXIT_FAILURE);
     }
 
     return cmdline;
@@ -946,11 +946,11 @@ static void parse_vcpu_affinity(libxl_domain_build_info *b_info,
             libxl_bitmap_init(&vcpu_affinity_array[j]);
             if (libxl_cpu_bitmap_alloc(ctx, &vcpu_affinity_array[j], 0)) {
                 fprintf(stderr, "Unable to allocate cpumap for vcpu %d\n", j);
-                exit(1);
+                exit(EXIT_FAILURE);
             }
 
             if (cpurange_parse(buf, &vcpu_affinity_array[j]))
-                exit(1);
+                exit(EXIT_FAILURE);
 
             j++;
         }
@@ -963,17 +963,17 @@ static void parse_vcpu_affinity(libxl_domain_build_info *b_info,
         libxl_bitmap_init(&vcpu_affinity_array[0]);
         if (libxl_cpu_bitmap_alloc(ctx, &vcpu_affinity_array[0], 0)) {
             fprintf(stderr, "Unable to allocate cpumap for vcpu 0\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
 
         if (cpurange_parse(buf, &vcpu_affinity_array[0]))
-            exit(1);
+            exit(EXIT_FAILURE);
 
         for (i = 1; i < b_info->max_vcpus; i++) {
             libxl_bitmap_init(&vcpu_affinity_array[i]);
             if (libxl_cpu_bitmap_alloc(ctx, &vcpu_affinity_array[i], 0)) {
                 fprintf(stderr, "Unable to allocate cpumap for vcpu %d\n", i);
-                exit(1);
+                exit(EXIT_FAILURE);
             }
             libxl_bitmap_copy(ctx, &vcpu_affinity_array[i],
                               &vcpu_affinity_array[0]);
@@ -1064,7 +1064,7 @@ static unsigned long parse_ulong(const char *str)
     val = strtoul(str, &endptr, 10);
     if (endptr == str || val == ULONG_MAX) {
         fprintf(stderr, "xl: failed to convert \"%s\" to number\n", str);
-        exit(1);
+        exit(EXIT_FAILURE);
     }
     return val;
 }
@@ -1086,7 +1086,7 @@ static void parse_vnuma_config(const XLU_Config *config,
     if (libxl_get_physinfo(ctx, &physinfo) != 0) {
         libxl_physinfo_dispose(&physinfo);
         fprintf(stderr, "libxl_get_physinfo failed\n");
-        exit(1);
+        exit(EXIT_FAILURE);
     }
 
     nr_nodes = physinfo.nr_nodes;
@@ -1105,7 +1105,7 @@ static void parse_vnuma_config(const XLU_Config *config,
         libxl_bitmap_init(&vcpu_parsed[i]);
         if (libxl_cpu_bitmap_alloc(ctx, &vcpu_parsed[i], b_info->max_vcpus)) {
             fprintf(stderr, "libxl_node_bitmap_alloc failed.\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
     }
 
@@ -1130,7 +1130,7 @@ static void parse_vnuma_config(const XLU_Config *config,
         xlu_cfg_value_get_list(config, vnode_spec, &vnode_config_list, 0);
         if (!vnode_config_list) {
             fprintf(stderr, "xl: cannot get vnode config option list\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
 
         for (conf_count = 0;
@@ -1152,7 +1152,7 @@ static void parse_vnuma_config(const XLU_Config *config,
                                            &value_untrimmed)) {
                     fprintf(stderr, "xl: failed to split \"%s\" into pair\n",
                             buf);
-                    exit(1);
+                    exit(EXIT_FAILURE);
                 }
                 trim(isspace, option_untrimmed, &option);
                 trim(isspace, value_untrimmed, &value);
@@ -1162,7 +1162,7 @@ static void parse_vnuma_config(const XLU_Config *config,
                     if (val >= nr_nodes) {
                         fprintf(stderr,
                                 "xl: invalid pnode number: %lu\n", val);
-                        exit(1);
+                        exit(EXIT_FAILURE);
                     }
                     p->pnode = val;
                     libxl_defbool_set(&b_info->numa_placement, false);
@@ -1218,20 +1218,20 @@ static void parse_vnuma_config(const XLU_Config *config,
     if (b_info->max_vcpus != 0) {
         if (b_info->max_vcpus != max_vcpus) {
             fprintf(stderr, "xl: vnuma vcpus and maxvcpus= mismatch\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
     } else {
         int host_cpus = libxl_get_online_cpus(ctx);
 
         if (host_cpus < 0) {
             fprintf(stderr, "Failed to get online cpus\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
 
         if (host_cpus < max_vcpus) {
             fprintf(stderr, "xl: vnuma specifies more vcpus than pcpus, "\
                     "use maxvcpus= to override this check.\n");
-            exit(1);
+            exit(EXIT_FAILURE);
         }
 
         b_info->max_vcpus = max_vcpus;
@@ -1241,7 +1241,7 @@ static void parse_vnuma_config(const XLU_Config *config,
     if (b_info->max_memkb != LIBXL_MEMKB_DEFAULT &&
         b_info->max_memkb != max_memkb) {
         fprintf(stderr, "xl: maxmem and vnuma memory size mismatch\n");
-        exit(1);
+        exit(EXIT_FAILURE);
     } else
         b_info->max_memkb = max_memkb;
 
@@ -3118,6 +3118,7 @@ void help(const char *command)
     }
 }
 
+/* Function returns -1 if the parsing fails */
 static int64_t parse_mem_size_kb(const char *mem)
 {
     char *endptr;
@@ -3264,7 +3265,7 @@ static int set_memory_max(uint32_t domid, const char *mem)
     memorykb = parse_mem_size_kb(mem);
     if (memorykb == -1) {
         fprintf(stderr, "invalid memory size: %s\n", mem);
-        exit(3);
+        exit(EXIT_FAILURE);
     }
 
     rc = libxl_domain_setmaxmem(ctx, domid, memorykb);
@@ -3302,7 +3303,7 @@ static void set_memory_target(uint32_t domid, const char *mem)
     memorykb = parse_mem_size_kb(mem);
     if (memorykb == -1)  {
         fprintf(stderr, "invalid memory size: %s\n", mem);
-        exit(3);
+        exit(EXIT_FAILURE);
     }
 
     libxl_set_memory_target(ctx, domid, memorykb, 0, /* enforce */ 1);
-- 
1.9.1

Re: [PATCH v3 1/5] xl: convert main() exit codes to EXIT_[SUCCESS|FAILURE]

[Wei Liu]

On Tue, Oct 27, 2015 at 03:20:48PM +0530, Harmandeep Kaur wrote:
[...]
>  };
>  
> +/*
> + *The xl process should always return either EXIT_SUCCESS or
> + *EXIT_FAILURE. main_* functions, implementing the various xl
> + *commands, can be treated as main() as if they are returning
> + *a process exit status and not a function return value.
> + */
> +

Missing spaces after "*". E.g.
   /*
    * The xl process ....
    * EXIT_FAILURE
    * ...
    */

With that fixed:

Acked-by: Wei Liu <wei.liu2@citrix.com>

(This means after fixing the minor problem you can put the above tag in
your commit message. If in doubt, please ask.)


>  int main_vcpulist(int argc, char **argv);
>  int main_info(int argc, char **argv);
>  int main_sharing(int argc, char **argv);
> -- 
> 1.9.1

Re: [PATCH v3 1/5] xl: convert main() exit codes to EXIT_[SUCCESS|FAILURE]

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 1158 bytes --]

On Tue, 2015-10-27 at 11:11 +0000, Wei Liu wrote:
> On Tue, Oct 27, 2015 at 03:20:48PM +0530, Harmandeep Kaur wrote:
> [...]
> >  };
> >  
> > +/*
> > + *The xl process should always return either EXIT_SUCCESS or
> > + *EXIT_FAILURE. main_* functions, implementing the various xl
> > + *commands, can be treated as main() as if they are returning
> > + *a process exit status and not a function return value.
> > + */
> > +
> 
> Missing spaces after "*". E.g.
>    /*
>     * The xl process ....
>     * EXIT_FAILURE
>     * ...
>     */
> 
> With that fixed:
> 
> Acked-by: Wei Liu <wei.liu2@citrix.com>
> 
> (This means after fixing the minor problem you can put the above tag
> in
> your commit message. If in doubt, please ask.)
> 
And, for what is worth, this one as well:

Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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Re: [PATCH v3 2/5] xl: improve return and exit codes of scheduling related functions

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 758 bytes --]

On Tue, 2015-10-27 at 15:20 +0530, Harmandeep Kaur wrote:
> Turning scheduling related functions exit codes towards using the
> EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary
> numbers
> or libxl return codes.
> 	- for main_*: arbitrary -> EXIT_SUCCESS|EXIT_FAILURE.
> 	- for internal fucntion: arbitrary -> 0/1.
> 
> Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
>
Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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Re: [PATCH v3 3/5] xl: improve return and exit codes of vcpu related functions

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 651 bytes --]

On Tue, 2015-10-27 at 15:20 +0530, Harmandeep Kaur wrote:
> Turning vcpu manipulation functions exit codes toward using the
> EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary
> numbers
> or libxl return codes.
> 
> Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
>
Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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Re: [PATCH v3 4/5] xl: improve return and exit codes of cpupool related functions

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 652 bytes --]

On Tue, 2015-10-27 at 15:20 +0530, Harmandeep Kaur wrote:
> Turning  cpupools related functions exit codes towards using the
> EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary
> numbers
> or libxl return codes.
> 
> Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
>
Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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Re: [PATCH v3 5/5] xl: improve return and exit codes of parse related functions

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 2399 bytes --]

On Tue, 2015-10-27 at 15:20 +0530, Harmandeep Kaur wrote:
> Turning  parsing related functions exit codes towards using the
> EXIT_[SUCCESS|FAILURE] constants, instead of instead of arbitrary
> numbers
> or libxl return codes.
> 	- for main_*: arbitrary -> EXIT_SUCCESS|EXIT_FAILURE.
> 	- for internal fucntion: arbitrary -> 0/1.
> 
> Don't touch parse_config_data() which is big enough to deserve its
> own patch.
> 
> Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
> ---
> v2->v3: Reverted return of parse_mem_size_kb() to -1.
> 	And exculded out of scope changes.
> 
There are a couple more of out of scope changes, though, at least
according to me. So, as Wei also said for patch 1, if you send v4 of
this series and, as far as this patch is concerned, you only...

> diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
> index 76d9af6..1ddf144 100644
> --- a/tools/libxl/xl_cmdimpl.c
> +++ b/tools/libxl/xl_cmdimpl.c

> @@ -3118,6 +3118,7 @@ void help(const char *command)
>      }
>  }
>  
> +/* Function returns -1 if the parsing fails */
>  static int64_t parse_mem_size_kb(const char *mem)
>  {
>      char *endptr;
> @@ -3264,7 +3265,7 @@ static int set_memory_max(uint32_t domid, const
> char *mem)
>      memorykb = parse_mem_size_kb(mem);
>      if (memorykb == -1) {
>          fprintf(stderr, "invalid memory size: %s\n", mem);
> -        exit(3);
> +        exit(EXIT_FAILURE);
>      }
>  
>      rc = libxl_domain_setmaxmem(ctx, domid, memorykb);
> @@ -3302,7 +3303,7 @@ static void set_memory_target(uint32_t domid,
> const char *mem)
>      memorykb = parse_mem_size_kb(mem);
>      if (memorykb == -1)  {
>          fprintf(stderr, "invalid memory size: %s\n", mem);
> -        exit(3);
> +        exit(EXIT_FAILURE);
>      }
>  
>      libxl_set_memory_target(ctx, domid, memorykb, 0, /* enforce */
> 1);
>
... Leave these two functions alone (set_memory_max() and
 set_memory_target()), then you can add the following tag to the
changelog:

Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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