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/*
* Use set/get/endgrent calls from two processes to iterate over the
* password database. This checks the multithreaded stuff works.
*/
#include <stdio.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <wait.h>
void dump_grent(char *id)
{
struct group *gr;
char fname[255];
FILE *fptr;
/* Open results file */
sprintf(fname, "/tmp/getgrent_r-%s.out-%d", id, getpid());
if ((fptr = fopen(fname, "w")) == NULL) {
fprintf(stderr, "ERROR: could not open file %s: %s\n", fname,
sys_errlist[errno]);
return;
}
/* Dump group database */
setgrent();
while((gr = getgrent()) != NULL) {
fprintf(fptr,"%s:%s:%d:%d\n", gr->gr_name, gr->gr_passwd,
gr->gr_gid);
}
endgrent();
/* Close results file */
fclose(fptr);
}
int main(int argc, char **argv)
{
pid_t pid;
/* Check args */
if (argc != 2) {
printf("ERROR: must specify output file identifier\n");
return 1;
}
/* Fork child process */
if ((pid = fork()) == -1) {
printf("ERROR: unable to fork\n");
return 1;
}
/* Handle test case */
if (pid > 0) {
int status;
/* Parent */
dump_grent(argv[1]);
wait(&status);
} else {
/* Child */
dump_grent(argv[1]);
return 0;
}
printf("PASS: run getgrent_r.c\n");
return 0;
}
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