* Re: minor trinity patch [not found] ` <20121220201903.GA14944@redhat.com> @ 2013-05-22 14:14 ` Nico Golde 2013-05-23 18:58 ` Tommi Rantala 0 siblings, 1 reply; 6+ messages in thread From: Nico Golde @ 2013-05-22 14:14 UTC (permalink / raw) To: trinity [-- Attachment #1: Type: text/plain, Size: 2684 bytes --] Hi, I'm not sure if you would like to change this.... In devices.c you scan for the device name in /proc/devices using the %as string. On bionic this doesn't seem to work and therefore no devices are found and because of this no ioctl group ever matches. I changed the code the following way: @@ -21,7 +22,8 @@ static size_t bldevs, chrdevs, miscdevs; static void parse_proc_devices(void) { FILE *fp; - char *name, *line = NULL; + char *line = NULL; + char name[32]; size_t n = 0; int block, major; void *new; @@ -33,30 +35,31 @@ static void parse_proc_devices(void) block = 0; while (getline(&line, &n, fp) >= 0) { + memset(name, 0, sizeof(name)); if (strcmp("Block devices:\n", line) == 0) block = 1; - else if (sscanf(line, "%d %as", &major, &name) == 2) { + else if (strcmp("Character devices:\n", line) == 0) + block = 0; + else if (sscanf(line, "%d %s", &major, &name) == 2) { if (block) { new = realloc(block_devs, (bldevs+1)*sizeof(*block_devs)); if (!new) { - free(name); continue; } block_devs = new; block_devs[bldevs].major = major; block_devs[bldevs].minor = 0; - block_devs[bldevs].name = name; + block_devs[bldevs].name = strdup(name); bldevs++; } else { new = realloc(char_devs, (chrdevs+1)*sizeof(*char_devs)); if (!new) { - free(name); continue; } char_devs = new; char_devs[chrdevs].major = major; char_devs[chrdevs].minor = 0; - char_devs[chrdevs].name = name; + char_devs[chrdevs].name = strdup(name); chrdevs++; } } I also added the additional strcmp just to make sure that the code works also if the order of character devices/block devices in /proc/devices changes at some point. Cheers Nico [-- Attachment #2: Type: application/pgp-signature, Size: 836 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: minor trinity patch 2013-05-22 14:14 ` minor trinity patch Nico Golde @ 2013-05-23 18:58 ` Tommi Rantala 2013-05-23 23:47 ` Nico Golde 0 siblings, 1 reply; 6+ messages in thread From: Tommi Rantala @ 2013-05-23 18:58 UTC (permalink / raw) To: Nico Golde; +Cc: trinity 2013/5/22 Nico Golde <nico@ngolde.de>: > Hi, > I'm not sure if you would like to change this.... > In devices.c you scan for the device name in /proc/devices using the %as > string. > On bionic this doesn't seem to work and therefore no devices are found and > because of this no ioctl group ever matches. No objections to changing this. > I changed the code the following way: > @@ -21,7 +22,8 @@ static size_t bldevs, chrdevs, miscdevs; > static void parse_proc_devices(void) > { > FILE *fp; > - char *name, *line = NULL; > + char *line = NULL; > + char name[32]; It would be IMO preferable to not hardcode the max length. > size_t n = 0; > int block, major; > void *new; > @@ -33,30 +35,31 @@ static void parse_proc_devices(void) > block = 0; > > while (getline(&line, &n, fp) >= 0) { > + memset(name, 0, sizeof(name)); > if (strcmp("Block devices:\n", line) == 0) > block = 1; > - else if (sscanf(line, "%d %as", &major, &name) == 2) { > + else if (strcmp("Character devices:\n", line) == 0) > + block = 0; > + else if (sscanf(line, "%d %s", &major, &name) == 2) { > if (block) { > new = realloc(block_devs, (bldevs+1)*sizeof(*block_devs)); > if (!new) { > - free(name); > continue; > } > block_devs = new; > block_devs[bldevs].major = major; > block_devs[bldevs].minor = 0; > - block_devs[bldevs].name = name; > + block_devs[bldevs].name = strdup(name); > bldevs++; > } else { > new = realloc(char_devs, (chrdevs+1)*sizeof(*char_devs)); > if (!new) { > - free(name); > continue; > } > char_devs = new; > char_devs[chrdevs].major = major; > char_devs[chrdevs].minor = 0; > - char_devs[chrdevs].name = name; > + char_devs[chrdevs].name = strdup(name); > chrdevs++; > } > } > > > I also added the additional strcmp just to make sure that the code works also > if the order of character devices/block devices in /proc/devices changes at > some point. > > Cheers > Nico ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: minor trinity patch 2013-05-23 18:58 ` Tommi Rantala @ 2013-05-23 23:47 ` Nico Golde 2013-06-03 5:55 ` Tommi Rantala 0 siblings, 1 reply; 6+ messages in thread From: Nico Golde @ 2013-05-23 23:47 UTC (permalink / raw) To: trinity Hi, * Tommi Rantala <tt.rantala@gmail.com> [2013-05-23 20:58]: > 2013/5/22 Nico Golde <nico@ngolde.de>: > > I changed the code the following way: > > @@ -21,7 +22,8 @@ static size_t bldevs, chrdevs, miscdevs; > > static void parse_proc_devices(void) > > { > > FILE *fp; > > - char *name, *line = NULL; > > + char *line = NULL; > > + char name[32]; > > It would be IMO preferable to not hardcode the max length. I agree, this is actually left over from quickly changing this. Are you aware of a proper maximum defined in the kernel headers or do we want to allocate this completely dynamically? Cheers Nico ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: minor trinity patch 2013-05-23 23:47 ` Nico Golde @ 2013-06-03 5:55 ` Tommi Rantala 2013-06-21 13:20 ` Nico Golde 0 siblings, 1 reply; 6+ messages in thread From: Tommi Rantala @ 2013-06-03 5:55 UTC (permalink / raw) To: Nico Golde; +Cc: trinity 2013/5/24 Nico Golde <nico@ngolde.de>: > Hi, > * Tommi Rantala <tt.rantala@gmail.com> [2013-05-23 20:58]: >> 2013/5/22 Nico Golde <nico@ngolde.de>: >> > I changed the code the following way: >> > @@ -21,7 +22,8 @@ static size_t bldevs, chrdevs, miscdevs; >> > static void parse_proc_devices(void) >> > { >> > FILE *fp; >> > - char *name, *line = NULL; >> > + char *line = NULL; >> > + char name[32]; >> >> It would be IMO preferable to not hardcode the max length. > > I agree, this is actually left over from quickly changing this. > Are you aware of a proper maximum defined in the kernel headers or do we want to > allocate this completely dynamically? dynamic please! > Cheers > Nico > -- > To unsubscribe from this list: send the line "unsubscribe trinity" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: minor trinity patch 2013-06-03 5:55 ` Tommi Rantala @ 2013-06-21 13:20 ` Nico Golde 2013-06-24 16:03 ` Nico Golde 0 siblings, 1 reply; 6+ messages in thread From: Nico Golde @ 2013-06-21 13:20 UTC (permalink / raw) To: trinity [-- Attachment #1.1: Type: text/plain, Size: 966 bytes --] Hi, * Tommi Rantala <tt.rantala@gmail.com> [2013-06-03 07:56]: > 2013/5/24 Nico Golde <nico@ngolde.de>: > > * Tommi Rantala <tt.rantala@gmail.com> [2013-05-23 20:58]: > >> 2013/5/22 Nico Golde <nico@ngolde.de>: > >> > I changed the code the following way: > >> > @@ -21,7 +22,8 @@ static size_t bldevs, chrdevs, miscdevs; > >> > static void parse_proc_devices(void) > >> > { > >> > FILE *fp; > >> > - char *name, *line = NULL; > >> > + char *line = NULL; > >> > + char name[32]; > >> > >> It would be IMO preferable to not hardcode the max length. > > > > I agree, this is actually left over from quickly changing this. > > Are you aware of a proper maximum defined in the kernel headers or do we want to > > allocate this completely dynamically? > > dynamic please! Sorry I had no time to look into this for a while. Patch attached. Cheers Nico -- Nico Golde - XMPP: nion@jabber.ccc.de - GPG: 0xA0A0AAAA [-- Attachment #1.2: 0001-devices.c-dont-use-as-scanf-format-string-but-instea.patch --] [-- Type: text/x-diff, Size: 1287 bytes --] From 9acc7c59c6ae2643ffba4edc17b04477f5cdaee0 Mon Sep 17 00:00:00 2001 From: Nico Golde <nion@debian.org> Date: Fri, 21 Jun 2013 15:18:58 +0200 Subject: [PATCH] devices.c: dont use %as scanf format string, but instead allocate and parse the device name manually for compatibility with non-glibc libcs --- devices.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/devices.c b/devices.c index 43433bc..d3916f9 100644 --- a/devices.c +++ b/devices.c @@ -21,7 +21,7 @@ static size_t bldevs, chrdevs, miscdevs; static void parse_proc_devices(void) { FILE *fp; - char *name, *line = NULL; + char *p, *name, *line = NULL; size_t n = 0; int block, major; void *new; @@ -35,7 +35,14 @@ static void parse_proc_devices(void) while (getline(&line, &n, fp) >= 0) { if (strcmp("Block devices:\n", line) == 0) block = 1; - else if (sscanf(line, "%d %as", &major, &name) == 2) { + else if (strcmp("Character devices:\n", line) == 0) + block = 0; + else if (sscanf(line, "%d %*s", &major) == 1) { + if ((p = strrchr(line, ' ')) == NULL) + continue; + p++; + name = strdup(p); + if (block) { new = realloc(block_devs, (bldevs+1)*sizeof(*block_devs)); if (!new) { -- 1.7.10.4 [-- Attachment #2: Type: application/pgp-signature, Size: 836 bytes --] ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: minor trinity patch 2013-06-21 13:20 ` Nico Golde @ 2013-06-24 16:03 ` Nico Golde 0 siblings, 0 replies; 6+ messages in thread From: Nico Golde @ 2013-06-24 16:03 UTC (permalink / raw) To: trinity [-- Attachment #1.1: Type: text/plain, Size: 458 bytes --] Hi, * Nico Golde <nico@ngolde.de> [2013-06-21 15:20]: > Sorry I had no time to look into this for a while. > Patch attached. Attached is another patch on top of the previous one. I didn't see that the device name includes the newline so that map_dev() will fail. This was kind of hard to see unless you have a driver and you know how the command ids should look like. Thanks Nico -- Nico Golde - XMPP: nion@jabber.ccc.de - GPG: 0xA0A0AAAA [-- Attachment #1.2: 0001-parse_proc_devices-cut-off-device-string-on-newline.patch --] [-- Type: text/x-diff, Size: 707 bytes --] From f850d64ba34c0a0d203912740c00fff03e8f8f3e Mon Sep 17 00:00:00 2001 From: Nico Golde <nion@debian.org> Date: Mon, 24 Jun 2013 17:56:19 +0200 Subject: [PATCH] parse_proc_devices: cut off device string on newline --- devices.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/devices.c b/devices.c index d3916f9..0166a53 100644 --- a/devices.c +++ b/devices.c @@ -38,6 +38,8 @@ static void parse_proc_devices(void) else if (strcmp("Character devices:\n", line) == 0) block = 0; else if (sscanf(line, "%d %*s", &major) == 1) { + if ((p = strchr(line, '\n')) != NULL) + *p = 0; if ((p = strrchr(line, ' ')) == NULL) continue; p++; -- 1.7.10.4 [-- Attachment #2: Type: application/pgp-signature, Size: 836 bytes --] ^ permalink raw reply related [flat|nested] 6+ messages in thread
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2013-05-22 14:14 ` minor trinity patch Nico Golde
2013-05-23 18:58 ` Tommi Rantala
2013-05-23 23:47 ` Nico Golde
2013-06-03 5:55 ` Tommi Rantala
2013-06-21 13:20 ` Nico Golde
2013-06-24 16:03 ` Nico Golde
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