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3f5403220f
When fopen() fails it return NULL, so condition where return value less than zero never evaluated to truth. Found by cppcheck.
86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
/*
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* Use set/get/endpwent calls from two processes to iterate over the
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* password database. This checks the multithreaded stuff works.
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*/
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#include <stdio.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <wait.h>
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void dump_pwent(char *id)
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{
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struct passwd *pw;
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char fname[255];
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FILE *fptr;
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/* Open results file */
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sprintf(fname, "/tmp/getpwent_r-%s.out-%d", id, getpid());
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if ((fptr = fopen(fname, "w")) == 0) {
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fprintf(stderr, "ERROR: could not open file %s: %s\n", fname,
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sys_errlist[errno]);
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return;
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}
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/* Dump passwd database */
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setpwent();
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while((pw = getpwent()) != NULL) {
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fprintf(fptr,"%s:%s:%s:%d:%d\n", pw->pw_name, pw->pw_passwd,
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pw->pw_gecos, pw->pw_uid, pw->pw_gid);
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}
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endpwent();
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/* Close results file */
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fclose(fptr);
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}
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#define NUM_FORKS 2
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int main(int argc, char **argv)
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{
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pid_t pids[NUM_FORKS];
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int i, status;
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/* Check args */
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if (argc != 2) {
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printf("ERROR: must specify output file identifier\n");
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return 1;
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}
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for(i = 0; i < NUM_FORKS; i++) {
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/* Fork off lots */
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if ((pids[i] = fork()) == -1) {
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perror("fork");
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return 1;
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}
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/* Child does tests */
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if (pids[i] == 0) {
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dump_pwent(argv[1]);
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return 0;
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}
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}
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/* Wait for everyone to finish */
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for (i = 0; i < NUM_FORKS; i++) {
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waitpid(pids[i], &status, 0);
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}
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printf("PASS: getpwent_r.c\n");
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return 0;
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}
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