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xz: Fix the fcntl() usage when creating a pipe for the self-pipe trick.

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Now it reads the old flags instead of blindly setting O_NONBLOCK.
The old code may have worked correctly, but this is better.
This commit is contained in:
Lasse Collin 2015-02-21 23:00:19 +02:00
parent 2205bb5853
commit ae984e31c1
1 changed files with 11 additions and 5 deletions
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16
src/xz/file_io.c
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@ -82,13 +82,19 @@ io_init(void)
// we are root.
warn_fchown = geteuid() == 0;
if (pipe(user_abort_pipe)
|| fcntl(user_abort_pipe[0], F_SETFL, O_NONBLOCK)
== -1
|| fcntl(user_abort_pipe[1], F_SETFL, O_NONBLOCK)
== -1)
// Create a pipe for the self-pipe trick.
if (pipe(user_abort_pipe))
message_fatal(_("Error creating a pipe: %s"),
strerror(errno));
// Make both ends of the pipe non-blocking.
for (unsigned i = 0; i < 2; ++i) {
int flags = fcntl(user_abort_pipe[i], F_GETFL);
if (flags == -1 || fcntl(user_abort_pipe[i], F_SETFL,
flags | O_NONBLOCK) == -1)
message_fatal(_("Error creating a pipe: %s"),
strerror(errno));
}
#endif
#ifdef __DJGPP__