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-s: close unused fds

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dup2 doesn’t close fds, it only duplicates them.  The old ones weren’t
closed, causing problems (like dwl blocking due to the child process
never reading from the reading end, even if stdin has been closed).
This commit is contained in:
Humm 2021-10-13 23:11:40 +02:00
parent 2d9740c2fc
commit ebfefa84ba
1 changed files with 2 additions and 0 deletions
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dwl.c
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@ -1823,11 +1823,13 @@ run(char *startup_cmd)
EBARF("startup: fork"); EBARF("startup: fork");
if (startup_pid == 0) { if (startup_pid == 0) {
dup2(piperw[0], STDIN_FILENO); dup2(piperw[0], STDIN_FILENO);
close(piperw[0]);
close(piperw[1]); close(piperw[1]);
execl("/bin/sh", "/bin/sh", "-c", startup_cmd, NULL); execl("/bin/sh", "/bin/sh", "-c", startup_cmd, NULL);
EBARF("startup: execl"); EBARF("startup: execl");
} }
dup2(piperw[1], STDOUT_FILENO); dup2(piperw[1], STDOUT_FILENO);
close(piperw[1]);
close(piperw[0]); close(piperw[0]);
} }
/* If nobody is reading the status output, don't terminate */ /* If nobody is reading the status output, don't terminate */