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libbb: new function bb_getgroups() - allocating wrapper around getgroups()

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function                                             old     new   delta
bb_getgroups                                           -     111    +111
nexpr                                                843     757     -86
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(add/remove: 2/0 grow/shrink: 0/1 up/down: 111/-86)            Total: 25 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2017-07-04 18:49:24 +02:00
parent 6a3bcf340a
commit a8cf9c5a3f
3 changed files with 63 additions and 26 deletions
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9
include/libbb.h
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@ -1033,6 +1033,15 @@ void die_if_bad_username(const char* name) FAST_FUNC;
#else
#define die_if_bad_username(name) ((void)(name))
#endif
/*
* Returns (-1) terminated malloced result of getgroups().
* Reallocs group_array (useful for repeated calls).
* ngroups is an initial size of array. It is rounded up to 32 for realloc.
* ngroups is updated on return.
* ngroups can be NULL: bb_getgroups(NULL, NULL) is valid usage.
* Dies on errors (on Linux, only xrealloc can cause this, not internal getgroups call).
*/
gid_t *bb_getgroups(int *ngroups, gid_t *group_array) FAST_FUNC;
#if ENABLE_FEATURE_UTMP
void FAST_FUNC write_new_utmp(pid_t pid, int new_type, const char *tty_name, const char *username, const char *hostname);