Re: [Qemu-devel] [PATCH v2] ivshmem: use error_report

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Sep 19, 2014 at 04:42:59PM +0800, zhanghailiang wrote:
> On 2014/9/19 15:34, zhanghailiang wrote:
> >On 2014/9/19 7:17, Andrew Jones wrote:
> >>Replace all the fprintf(stderr, ...) calls with error_report.
> >>Also make sure exit() consistently uses the error code 1. A few calls
> >>used -1.
> >>
> >>Signed-off-by: Andrew Jones <drjones@redhat.com>
> >>---
> >>  hw/misc/ivshmem.c | 39 +++++++++++++++++++--------------------
> >>  1 file changed, 19 insertions(+), 20 deletions(-)
> >>
> >>diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
> >>index bf585b7691998..b3983296f58fa 100644
> >>--- a/hw/misc/ivshmem.c
> >>+++ b/hw/misc/ivshmem.c
> >>@@ -300,8 +300,8 @@ static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *
> >>      chr = qemu_chr_open_eventfd(eventfd);
> >>
> >>      if (chr == NULL) {
> >>-        fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
> >>-        exit(-1);
> >>+        error_report("creating eventfd for eventfd %d failed", eventfd);
> >>+        exit(1);
> >>      }
> >>      qemu_chr_fe_claim_no_fail(chr);
> >>
> >>@@ -328,15 +328,14 @@ static int check_shm_size(IVShmemState *s, int fd) {
> >>      struct stat buf;
> >>
> >>      if (fstat(fd, &buf) < 0) {
> >>-        fprintf(stderr, "ivshmem: exiting: fstat on fd %d failed: %s\n",
> >>+        error_report("exiting: fstat on fd %d failed: %s",
> >>                  fd, strerror(errno));
> >
> >The indentation looks weird, better to fix it.;)
> >More of the same elsewhere.
> >
> 
> Er, actually, maybe for print like function, it is no need to indent like other function.
> So just ignore this comment, Sorry.;)


No, I agree with the original comment.
Please indent continuation lines to the right of the opening (,
here and elsewhere.


> >>          return -1;
> >>      }
> >>
> >>      if (s->ivshmem_size > buf.st_size) {
> >>-        fprintf(stderr,
> >>-                "IVSHMEM ERROR: Requested memory size greater"
> >>-                " than shared object size (%" PRIu64 " > %" PRIu64")\n",
> >>+        error_report("Requested memory size greater"
> >>+                " than shared object size (%" PRIu64 " > %" PRIu64")",
> >>                  s->ivshmem_size, (uint64_t)buf.st_size);
> >>          return -1;
> >>      } else {
> >>@@ -510,7 +509,7 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
> >>      incoming_fd = dup(tmp_fd);
> >>
> >>      if (incoming_fd == -1) {
> >>-        fprintf(stderr, "could not allocate file descriptor %s\n",
> >>+        error_report("could not allocate file descriptor %s",
> >>                                                              strerror(errno));
> >>          close(tmp_fd);
> >>          return;
> >>@@ -524,7 +523,7 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
> >>          s->max_peer = 0;
> >>
> >>          if (check_shm_size(s, incoming_fd) == -1) {
> >>-            exit(-1);
> >>+            exit(1);
> >>          }
> >>
> >>          /* mmap the region and map into the BAR2 */
> >>@@ -618,13 +617,13 @@ static uint64_t ivshmem_get_size(IVShmemState * s) {
> >>              value <<= 30;
> >>              break;
> >>          default:
> >>-            fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg);
> >>+            error_report("invalid ram size: %s", s->sizearg);
> >>              exit(1);
> >>      }
> >>
> >>      /* BARs must be a power of 2 */
> >>      if (!is_power_of_two(value)) {
> >>-        fprintf(stderr, "ivshmem: size must be power of 2\n");
> >>+        error_report("size must be power of 2");
> >>          exit(1);
> >>      }
> >>
> >>@@ -676,7 +675,7 @@ static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
> >>      }
> >>
> >>      if (proxy->role_val == IVSHMEM_PEER) {
> >>-        fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n");
> >>+        error_report("'peer' devices are not migratable");
> >>          return -EINVAL;
> >>      }
> >>
> >>@@ -722,7 +721,7 @@ static int pci_ivshmem_init(PCIDevice *dev)
> >>      /* IRQFD requires MSI */
> >>      if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
> >>          !ivshmem_has_feature(s, IVSHMEM_MSI)) {
> >>-        fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n");
> >>+        error_report("ioeventfd/irqfd requires MSI");
> >>          exit(1);
> >>      }
> >>
> >>@@ -733,7 +732,7 @@ static int pci_ivshmem_init(PCIDevice *dev)
> >>          } else if (strncmp(s->role, "master", 7) == 0) {
> >>              s->role_val = IVSHMEM_MASTER;
> >>          } else {
> >>-            fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n");
> >>+            error_report("'role' must be 'peer' or 'master'");
> >>              exit(1);
> >>          }
> >>      } else {
> >>@@ -773,8 +772,8 @@ static int pci_ivshmem_init(PCIDevice *dev)
> >>           * to the ivshmem server to receive the memory region */
> >>
> >>          if (s->shmobj != NULL) {
> >>-            fprintf(stderr, "WARNING: do not specify both 'chardev' "
> >>-                                                "and 'shm' with ivshmem\n");
> >>+            error_report("WARNING: do not specify both 'chardev' "
> >>+                                                "and 'shm' with ivshmem");
> >>          }
> >>
> >>          IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
> >>@@ -802,7 +801,7 @@ static int pci_ivshmem_init(PCIDevice *dev)
> >>          int fd;
> >>
> >>          if (s->shmobj == NULL) {
> >>-            fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n");
> >>+            error_report("Must specify 'chardev' or 'shm' to ivshmem");
> >>              exit(1);
> >>          }
> >>
> >>@@ -814,18 +813,18 @@ static int pci_ivshmem_init(PCIDevice *dev)
> >>                          S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
> >>             /* truncate file to length PCI device's memory */
> >>              if (ftruncate(fd, s->ivshmem_size) != 0) {
> >>-                fprintf(stderr, "ivshmem: could not truncate shared file\n");
> >>+                error_report("could not truncate shared file");
> >>              }
> >>
> >>          } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
> >>                          S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
> >>-            fprintf(stderr, "ivshmem: could not open shared file\n");
> >>-            exit(-1);
> >>+            error_report("could not open shared file");
> >>+            exit(1);
> >>
> >>          }
> >>
> >>          if (check_shm_size(s, fd) == -1) {
> >>-            exit(-1);
> >>+            exit(1);
> >>          }
> >>
> >>          create_shared_memory_BAR(s, fd);
> >>
> >
> >
> >
> >
> >.
> >
>