diff options
Diffstat (limited to 'libudev/libudev-util-private.c')
| -rw-r--r-- | libudev/libudev-util-private.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/libudev/libudev-util-private.c b/libudev/libudev-util-private.c index f7daa9460b..021734d772 100644 --- a/libudev/libudev-util-private.c +++ b/libudev/libudev-util-private.c @@ -149,8 +149,8 @@ uid_t util_lookup_user(struct udev *udev, const char *user) gid_t util_lookup_group(struct udev *udev, const char *group) { char *endptr; - int buflen = sysconf(_SC_GETGR_R_SIZE_MAX); - char buf[buflen]; + int buflen; + char *buf; struct group grbuf; struct group *gr; gid_t gid = 0; @@ -161,15 +161,31 @@ gid_t util_lookup_group(struct udev *udev, const char *group) if (endptr[0] == '\0') return gid; - errno = 0; - getgrnam_r(group, &grbuf, buf, buflen, &gr); - if (gr != NULL) - return gr->gr_gid; - if (errno == 0 || errno == ENOENT || errno == ESRCH) - err(udev, "specified group '%s' unknown\n", group); - else - err(udev, "error resolving group '%s': %m\n", group); - return 0; + buflen = sysconf(_SC_GETGR_R_SIZE_MAX); + if (buflen < 0) + buflen = 1000; + buf = NULL; + gid = 0; + for (;;) { + buf = realloc(buf, buflen); + if (!buf) + break; + errno = 0; + getgrnam_r(group, &grbuf, buf, buflen, &gr); + if (gr != NULL) + gid = gr->gr_gid; + else if (errno == ERANGE) { + buflen *= 2; + continue; + } + else if (errno == 0 || errno == ENOENT || errno == ESRCH) + err(udev, "specified group '%s' unknown\n", group); + else + err(udev, "error resolving group '%s': %m\n", group); + break; + } + free(buf); + return gid; } /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */ |