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Error out if dup2 doesn't return the fd we want

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sin 2014-04-10 11:21:12 +01:00
parent dfc2f7edac
commit f308a58740
1 changed files with 6 additions and 3 deletions
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9
getty.c
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@ -65,9 +65,12 @@ main(int argc, char *argv[])
fd = open(tty, O_RDWR); fd = open(tty, O_RDWR);
if (fd < 0) if (fd < 0)
eprintf("open %s:", tty); eprintf("open %s:", tty);
dup2(fd, STDIN_FILENO); if (dup2(fd, STDIN_FILENO) != STDIN_FILENO)
dup2(fd, STDOUT_FILENO); eprintf("dup2:");
dup2(fd, STDERR_FILENO); if (dup2(fd, STDOUT_FILENO) != STDOUT_FILENO)
eprintf("dup2:");
if (dup2(fd, STDERR_FILENO) != STDERR_FILENO)
eprintf("dup2:");
sa.sa_handler = SIG_DFL; sa.sa_handler = SIG_DFL;
sa.sa_flags = 0; sa.sa_flags = 0;