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fix fd leak on races and cancellation in ctermid

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This commit is contained in:
Rich Felker
2013-07-09 00:42:09 -04:00
parent 0716b10ac8
commit cdf0f53f8b
1 changed files with 3 additions and 2 deletions
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5
src/unistd/ctermid.c
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@@ -4,6 +4,7 @@
#include <fcntl.h> #include <fcntl.h>
#include <unistd.h> #include <unistd.h>
#include <limits.h> #include <limits.h>
#include "syscall.h"
char *ctermid(char *s) char *ctermid(char *s)
{ {
@@ -13,11 +14,11 @@ char *ctermid(char *s)
if (!s2) s2 = malloc(L_ctermid); if (!s2) s2 = malloc(L_ctermid);
s = s2; s = s2;
} }
fd = open("/dev/tty", O_WRONLY | O_NOCTTY); fd = open("/dev/tty", O_WRONLY | O_NOCTTY | O_CLOEXEC);
if (fd < 0) if (fd < 0)
return strcpy(s, ""); return strcpy(s, "");
if (ttyname_r(fd, s, L_ctermid)) if (ttyname_r(fd, s, L_ctermid))
strcpy(s, ""); strcpy(s, "");
close(fd); __syscall(SYS_close, fd);
return s; return s;
} }