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authorDan McGee <dan@archlinux.org>2008-10-12 21:07:49 -0500
committerDan McGee <dan@archlinux.org>2008-10-12 21:35:30 -0500
commit30851a24ff68b00898565a1144926d83c623e6bf (patch)
tree59dc7db2a36f7f446db0869ad14b5cccc5144db6
parentf0e1846b51dfdeb095038b6b04d307ddfdec0029 (diff)
Make interrupt handler async-safe
Calling printf() in a signal handler can be dangerous, so avoid it by writing directly which is guaranteed to be safe according to signal(7). Signed-off-by: Dan McGee <dan@archlinux.org>
-rw-r--r--src/pacman/pacman.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/src/pacman/pacman.c b/src/pacman/pacman.c
index 3a56a9d3..0e133df6 100644
--- a/src/pacman/pacman.c
+++ b/src/pacman/pacman.c
@@ -36,6 +36,7 @@
#include <sys/utsname.h> /* uname */
#include <locale.h> /* setlocale */
#include <time.h> /* time_t */
+#include <errno.h>
#if defined(PACMAN_DEBUG) && defined(HAVE_MCHECK_H)
#include <mcheck.h> /* debug tracing (mtrace) */
#endif
@@ -211,21 +212,34 @@ static void cleanup(int ret) {
exit(ret);
}
+/** Write function that correctly handles EINTR.
+ */
+static ssize_t xwrite(int fd, const void *buf, size_t count)
+{
+ ssize_t ret;
+ while((ret = write(fd, buf, count)) == -1 && errno == EINTR);
+ return(ret);
+}
+
/** Catches thrown signals. Performs necessary cleanup to ensure database is
* in a consistant state.
* @param signum the thrown signal
*/
static RETSIGTYPE handler(int signum)
{
- if(signum==SIGSEGV)
- {
- /* write a log message and write to stderr */
- pm_printf(PM_LOG_ERROR, _("segmentation fault\n"));
- pm_fprintf(stderr, PM_LOG_ERROR,
- _("Internal pacman error: Segmentation fault.\n"
- "Please submit a full bug report with --debug if appropriate.\n"));
+ int out = fileno(stdout);
+ int err = fileno(stderr);
+ if(signum == SIGSEGV) {
+ const char *msg1 = "error: segmentation fault\n";
+ const char *msg2 = "Internal pacman error: Segmentation fault.\n"
+ "Please submit a full bug report with --debug if appropriate.\n";
+ /* write a error message to out, the rest to err */
+ xwrite(out, msg1, strlen(msg1));
+ xwrite(err, msg2, strlen(msg2));
exit(signum);
} else if((signum == SIGINT)) {
+ const char *msg = "\nInterrupt signal received\n";
+ xwrite(err, msg, strlen(msg));
if(alpm_trans_interrupt() == 0) {
/* a transaction is being interrupted, don't exit pacman yet. */
return;
@@ -233,7 +247,7 @@ static RETSIGTYPE handler(int signum)
/* no commiting transaction, we can release it now and then exit pacman */
alpm_trans_release();
/* output a newline to be sure we clear any line we may be on */
- printf("\n");
+ xwrite(out, "\n", 1);
}
cleanup(signum);
}