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make daemon try the operations that might fail before fork rather than after

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This commit is contained in:
Rich Felker
2011-02-17 10:30:00 -05:00
parent 19e35c500b
commit 187fe29d5b
1 changed files with 10 additions and 12 deletions
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22
src/linux/daemon.c
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@ -3,7 +3,16 @@
int daemon(int nochdir, int noclose) int daemon(int nochdir, int noclose)
{ {
int fd; if (!nochdir && chdir("/"))
return -1;
if (!noclose) {
int fd, failed = 0;
if ((fd = open("/dev/null", O_RDWR)) < 0) return -1;
if (dup2(fd, 0) < 0 || dup2(fd, 1) < 0 || dup2(fd, 2) < 0)
failed++;
if (fd > 2) close(fd);
if (failed) return -1;
}
switch(fork()) { switch(fork()) {
case 0: break; case 0: break;
@ -19,16 +28,5 @@ int daemon(int nochdir, int noclose)
default: _exit(0); default: _exit(0);
} }
if (!nochdir && chdir("/"))
return -1;
if (!noclose) {
int failed = 0;
if ((fd = open("/dev/null", O_RDWR)) < 0) return -1;
if (dup2(fd, 0) < 0 || dup2(fd, 1) < 0 || dup2(fd, 2) < 0)
failed++;
if (fd > 2) close(fd);
if (failed) return -1;
}
return 0; return 0;
} }