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Safeguarded dup2 and close sequence in getcmd

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This commit is contained in:
Ashish Kumar Yadav 2020-08-24 04:19:45 +05:30
parent d4a726ad78
commit e6844edbf1
1 changed files with 6 additions and 4 deletions
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10
dwmblocks.c
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@ -81,11 +81,13 @@ getcmd(Block *block, int sigval)
case 0:
close(ConnectionNumber(dpy));
close(fd[0]);
if (dup2(fd[1], STDOUT_FILENO) != STDOUT_FILENO) {
perror("getcmd - child - dup2");
exit(1);
if (fd[1] != STDOUT_FILENO) {
if (dup2(fd[1], STDOUT_FILENO) != STDOUT_FILENO) {
perror("getcmd - child - dup2");
exit(1);
}
close(fd[1]);
}
close(fd[1]);
if (sigval == NILL) {
char *arg[] = { block->pathu, NULL };