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Use the double fork trick to properly reap spawned processes - sinit - suckless… |
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git clone git://git.suckless.org/sinit |
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--- |
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commit fc4fd37ba81aa101b9790a875511456b4e57d66c |
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parent eae5382f6ac183086944ff964eeaa95fd7dbe936 |
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Author: sin <[email protected]> |
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Date: Fri, 7 Feb 2014 11:14:38 +0000 |
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Use the double fork trick to properly reap spawned processes |
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Diffstat: |
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M sinit.c | 15 +++++++++++---- |
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1 file changed, 11 insertions(+), 4 deletions(-) |
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--- |
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diff --git a/sinit.c b/sinit.c |
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@@ -34,7 +34,7 @@ main(void) |
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sigset_t set; |
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pid_t pid; |
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fd_set rfds; |
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- int c, fd, n; |
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+ int status, fd, n; |
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if (getpid() != 1) |
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return EXIT_FAILURE; |
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@@ -48,7 +48,7 @@ main(void) |
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return EXIT_FAILURE; |
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if (pid > 0) |
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for (;;) |
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- wait(&c); |
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+ wait(&status); |
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sigprocmask(SIG_UNBLOCK, &set, 0); |
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@@ -102,17 +102,24 @@ dispatchcmd(int fd) |
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static void |
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spawn(const Arg *arg) |
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{ |
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+ int status; |
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pid_t pid; |
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char *const *p = arg->v; |
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pid = fork(); |
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- if (pid < 0) |
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+ if (pid < 0) { |
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weprintf("sinit: fork:"); |
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- if (pid == 0) { |
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+ } else if (pid == 0) { |
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+ pid = fork(); |
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+ if (pid < 0) |
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+ weprintf("sinit: fork:"); |
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+ else if (pid > 0) |
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+ exit(0); |
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setsid(); |
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setpgid(0, 0); |
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execvp(*p, p); |
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weprintf("sinit: execvp %s:", p); |
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_exit(errno == ENOENT ? 127 : 126); |
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} |
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+ waitpid(pid, &status, 0); |
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} |
