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core: check return value of getgrnam_r() instead of errno

Browse source 
According to POSIX getgrnam_r() returns the error code as return value,
and not in errno. Honour that.

Pointed out and inspired by a patch from Ted Percival.
This commit is contained in:
Lennart Poettering 2009-08-20 00:20:03 +02:00
parent f4f16ab10d
commit c5bd72509e
1 changed files with 34 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

74
src/pulsecore/core-util.c
View file

@ -975,6 +975,7 @@ static int is_group(gid_t gid, const char *name) {
int r = -1;
#ifdef HAVE_GETGRGID_R
#ifdef _SC_GETGR_R_SIZE_MAX
n = sysconf(_SC_GETGR_R_SIZE_MAX);
#else
@ -985,38 +986,25 @@ static int is_group(gid_t gid, const char *name) {
data = pa_xmalloc((size_t) n);
if ((errno = getgrgid_r(gid, &group, data, (size_t) n, &result)) || !result)
#else
errno = 0;
if (getgrgid_r(gid, &group, data, (size_t) n, &result) < 0 || !result) {
pa_log("getgrgid_r(%u): %s", (unsigned) gid, pa_cstrerror(errno));
if (!(result = getgrgid(gid)))
#endif
{
if (!errno)
errno = ENOENT;
goto finish;
}
r = strcmp(name, result->gr_name) == 0;
finish:
pa_xfree(data);
#else
/* XXX Not thread-safe, but needed on OSes (e.g. FreeBSD 4.X) that do not
* support getgrgid_r. */
errno = 0;
if (!(result = getgrgid(gid))) {
pa_log("getgrgid(%u): %s", gid, pa_cstrerror(errno));
if (!errno)
errno = ENOENT;
goto finish;
}
r = strcmp(name, result->gr_name) == 0;
finish:
#endif
pa_xfree(data);
return r;
}
@ -1065,12 +1053,14 @@ finish:
/* Check whether the specifc user id is a member of the specified group */
int pa_uid_in_group(uid_t uid, const char *name) {
char *g_buf, *p_buf;
char *g_buf = NULL, *p_buf = NULL;
long g_n, p_n;
struct group grbuf, *gr;
struct group grbuf, *gr = NULL;
char **i;
int r = -1;
#ifdef HAVE_GETGRNAM_R
#ifdef _SC_GETGR_R_SIZE_MAX
g_n = sysconf(_SC_GETGR_R_SIZE_MAX);
#else
@ -1081,6 +1071,19 @@ int pa_uid_in_group(uid_t uid, const char *name) {
g_buf = pa_xmalloc((size_t) g_n);
if ((errno = getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr)) != 0 || !gr)
#else
errno = 0;
if (!(gr = getgrnam(name)))
#endif
{
if (!errno)
errno = ENOENT;
goto finish;
}
#ifdef HAVE_GETPWNAM_R
#ifdef _SC_GETPW_R_SIZE_MAX
p_n = sysconf(_SC_GETPW_R_SIZE_MAX);
#else
@ -1090,26 +1093,16 @@ int pa_uid_in_group(uid_t uid, const char *name) {
p_n = 512;
p_buf = pa_xmalloc((size_t) p_n);
errno = 0;
#ifdef HAVE_GETGRNAM_R
if (getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr) != 0 || !gr)
#else
if (!(gr = getgrnam(name)))
#endif
{
if (!errno)
errno = ENOENT;
goto finish;
}
r = 0;
for (i = gr->gr_mem; *i; i++) {
struct passwd pwbuf, *pw;
struct passwd pwbuf, *pw = NULL;
#ifdef HAVE_GETPWNAM_R
if (getpwnam_r(*i, &pwbuf, p_buf, (size_t) p_n, &pw) != 0 || !pw)
if ((errno = getpwnam_r(*i, &pwbuf, p_buf, (size_t) p_n, &pw)) != 0 || !pw)
#else
errno = 0;
if (!(pw = getpwnam(*i)))
#endif
continue;
@ -1130,9 +1123,11 @@ finish:
/* Get the GID of a gfiven group, return (gid_t) -1 on failure. */
gid_t pa_get_gid_of_group(const char *name) {
gid_t ret = (gid_t) -1;
char *g_buf;
char *g_buf = NULL;
long g_n;
struct group grbuf, *gr;
struct group grbuf, *gr = NULL;
#ifdef HAVE_GETGRNAM_R
#ifdef _SC_GETGR_R_SIZE_MAX
g_n = sysconf(_SC_GETGR_R_SIZE_MAX);
@ -1144,10 +1139,9 @@ gid_t pa_get_gid_of_group(const char *name) {
g_buf = pa_xmalloc((size_t) g_n);
errno = 0;
#ifdef HAVE_GETGRNAM_R
if (getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr) != 0 || !gr)
if ((errno = getgrnam_r(name, &grbuf, g_buf, (size_t) g_n, &gr)) != 0 || !gr)
#else
errno = 0;
if (!(gr = getgrnam(name)))
#endif
{