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popen: handle issues with fd0/1 being closed

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also check for failure of dup2 and abort the child rather than
reading/writing the wrong file.
This commit is contained in:
Rich Felker 2012-06-20 14:32:48 -04:00
parent b3d7d062af
commit f305467aad
1 changed files with 3 additions and 3 deletions
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6
src/stdio/popen.c
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@ -31,9 +31,9 @@ FILE *popen(const char *cmd, const char *mode)
close(p[1]); close(p[1]);
return NULL; return NULL;
case 0: case 0:
dup2(p[1-op], 1-op); if (dup2(p[1-op], 1-op) < 0) _exit(127);
close(p[0]); if (p[0] != 1-op) close(p[0]);
close(p[1]); if (p[1] != 1-op) close(p[1]);
execl("/bin/sh", "sh", "-c", cmd, (char *)0); execl("/bin/sh", "sh", "-c", cmd, (char *)0);
_exit(127); _exit(127);
} }