getgroups.c

Print out the gids of all groups for the current user. [詳細]

ソースコードを見る。

関数
int	main (UNUSED(int argc), UNUSED(char *argv[]))

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説明

Print out the gids of all groups for the current user.

This is like `id -G` on Linux, but it's too hard to find a portable equivalent.

getgroups.c で定義されています。

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関数

int main	(	UNUSED(int argc)	,
		UNUSED(char *argv[])
	)

getgroups.c の 30 行で定義されています。

{
        int n, i;
        gid_t *list;
        gid_t gid = MY_GID();
        int gid_in_list = 0;

#ifdef HAVE_GETGROUPS
        if ((n = getgroups(0, NULL)) < 0) {
                perror("getgroups");
                return 1;
        }
#else
        n = 0;
#endif

        list = (gid_t*)malloc(sizeof (gid_t) * (n + 1));
        if (!list) {
                fprintf(stderr, "out of memory!\n");
                exit(1);
        }

#ifdef HAVE_GETGROUPS
        if (n > 0)
                n = getgroups(n, list);
#endif

        for (i = 0; i < n; i++)  {
                printf("%lu ", (unsigned long)list[i]);
                if (list[i] == gid)
                        gid_in_list = 1;
        }
        /* The default gid might not be in the list on some systems. */
        if (!gid_in_list)
                printf("%lu", (unsigned long)gid);
        printf("\n");
                
        return 0;
}

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