forked from Imagelibrary/rtems
76 lines
1.1 KiB
C
76 lines
1.1 KiB
C
/**
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* @file
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*
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* @brief Get Supplementary IDs
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* @ingroup libcsupport
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <grp.h>
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#include <pwd.h>
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#include <string.h>
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#include <unistd.h>
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#include <rtems/seterr.h>
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/**
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* 4.2.3 Get Supplementary IDs, P1003.1b-1993, p. 86
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*/
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int getgroups(
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int gidsetsize,
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gid_t grouplist[]
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)
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{
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int rv;
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struct passwd pwd;
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struct passwd *pwd_res;
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char buf[256];
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gid_t gid;
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const char *user;
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struct group *grp;
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rv = getpwuid_r(getuid(), &pwd, &buf[0], sizeof(buf), &pwd_res);
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if (rv != 0) {
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return rv;
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}
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gid = pwd.pw_gid;
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user = pwd.pw_name;
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setgrent();
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while ((grp = getgrent()) != NULL) {
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char **mem = &grp->gr_mem[0];
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if (grp->gr_gid == gid) {
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continue;
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}
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while (*mem != NULL) {
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if (strcmp(*mem, user) == 0) {
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if (rv < gidsetsize) {
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grouplist[rv] = grp->gr_gid;
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}
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++rv;
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break;
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}
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++mem;
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}
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}
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endgrent();
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if (gidsetsize == 0 || rv <= gidsetsize) {
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return rv;
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} else {
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rtems_set_errno_and_return_minus_one(EINVAL);
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}
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}
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