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Introduced lock on device file

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Tio will now test for and obtain an advisory lock on the tty device file
to prevent starting multiple sessions on the same tty device.
This commit is contained in:
Martin Lund 2016-05-12 15:44:59 +02:00
parent 8be401559d
commit ef98fc7fa2
1 changed files with 10 additions and 0 deletions
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10
src/tty.c
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@ -27,6 +27,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/file.h>
#include <fcntl.h>
#include <termios.h>
#include <stdbool.h>
@ -146,6 +147,7 @@ void disconnect_tty(void)
if (connected)
{
color_printf("[tio %s] Disconnected", current_time());
flock(fd, LOCK_UN);
close(fd);
connected = false;
}
@ -184,6 +186,14 @@ int connect_tty(void)
goto error_isatty;
}
/* Lock device file */
status = flock(fd, LOCK_EX | LOCK_NB);
if ((status == -1) && (errno == EWOULDBLOCK))
{
printf("Error: Device file is locked by another process\r\n");
exit(EXIT_FAILURE);
}
/* Flush stale I/O data (if any) */
tcflush(fd, TCIOFLUSH);