diff options
Diffstat (limited to 'lib/libc/gen')
| -rw-r--r-- | lib/libc/gen/initgroups.3 | 7 | ||||
| -rw-r--r-- | lib/libc/gen/initgroups.c | 21 |
2 files changed, 22 insertions, 6 deletions
diff --git a/lib/libc/gen/initgroups.3 b/lib/libc/gen/initgroups.3 index 2fe2dd9..3ed3ca7 100644 --- a/lib/libc/gen/initgroups.3 +++ b/lib/libc/gen/initgroups.3 @@ -65,6 +65,13 @@ function may fail and set .Va errno for any of the errors specified for the library function .Xr setgroups 2 . +It may also return: +.Bl -tag -width Er +.It Bq Er ENOMEM +The +.Fn initgroups +function was unable to allocate temporary storage. +.El .Sh SEE ALSO .Xr setgroups 2 , .Xr getgrouplist 3 diff --git a/lib/libc/gen/initgroups.c b/lib/libc/gen/initgroups.c index 299ae50..aacaf7e 100644 --- a/lib/libc/gen/initgroups.c +++ b/lib/libc/gen/initgroups.c @@ -35,10 +35,12 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> -#include <stdio.h> #include "namespace.h" #include <err.h> #include "un-namespace.h" +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> #include <unistd.h> int @@ -46,14 +48,21 @@ initgroups(uname, agroup) const char *uname; gid_t agroup; { - int ngroups; + int ngroups, ret; + long ngroups_max; + gid_t *groups; + /* - * Provide space for one group more than NGROUPS to allow + * Provide space for one group more than possible to allow * setgroups to fail and set errno. */ - gid_t groups[NGROUPS + 1]; + ngroups_max = sysconf(_SC_NGROUPS_MAX) + 2; + if ((groups = malloc(sizeof(*groups) * ngroups_max)) == NULL) + return (ENOMEM); - ngroups = NGROUPS + 1; + ngroups = (int)ngroups_max; getgrouplist(uname, agroup, groups, &ngroups); - return (setgroups(ngroups, groups)); + ret = setgroups(ngroups, groups); + free(groups); + return (ret); } |
