summaryrefslogtreecommitdiffstats
path: root/lib/sh/ufuncs.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--lib/sh/ufuncs.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/lib/sh/ufuncs.c b/lib/sh/ufuncs.c
new file mode 100644
index 0000000..ad9284c
--- /dev/null
+++ b/lib/sh/ufuncs.c
@@ -0,0 +1,149 @@
+/* ufuncs - sleep and alarm functions that understand fractional values */
+
+/* Copyright (C) 2008,2009 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include "bashtypes.h"
+
+#if defined (TIME_WITH_SYS_TIME)
+# include <sys/time.h>
+# include <time.h>
+#else
+# if defined (HAVE_SYS_TIME_H)
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
+#if defined (HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
+#include <errno.h>
+#if !defined (errno)
+extern int errno;
+#endif /* !errno */
+
+#if defined (HAVE_SELECT)
+# include "posixselect.h"
+# include "quit.h"
+# include "trap.h"
+# include "stat-time.h"
+#endif
+
+/* A version of `alarm' using setitimer if it's available. */
+
+#if defined (HAVE_SETITIMER)
+unsigned int
+falarm(secs, usecs)
+ unsigned int secs, usecs;
+{
+ struct itimerval it, oit;
+
+ it.it_interval.tv_sec = 0;
+ it.it_interval.tv_usec = 0;
+
+ it.it_value.tv_sec = secs;
+ it.it_value.tv_usec = usecs;
+
+ if (setitimer(ITIMER_REAL, &it, &oit) < 0)
+ return (-1); /* XXX will be converted to unsigned */
+
+ /* Backwards compatibility with alarm(3) */
+ if (oit.it_value.tv_usec)
+ oit.it_value.tv_sec++;
+ return (oit.it_value.tv_sec);
+}
+#else
+int
+falarm (secs, usecs)
+ unsigned int secs, usecs;
+{
+ if (secs == 0 && usecs == 0)
+ return (alarm (0));
+
+ if (secs == 0 || usecs >= 500000)
+ {
+ secs++;
+ usecs = 0;
+ }
+ return (alarm (secs));
+}
+#endif /* !HAVE_SETITIMER */
+
+/* A version of sleep using fractional seconds and select. I'd like to use
+ `usleep', but it's already taken */
+
+#if defined (HAVE_TIMEVAL) && (defined (HAVE_SELECT) || defined (HAVE_PSELECT))
+int
+fsleep(sec, usec)
+ unsigned int sec, usec;
+{
+ int e, r;
+ sigset_t blocked_sigs, prevmask;
+#if defined (HAVE_PSELECT)
+ struct timespec ts;
+#else
+ struct timeval tv;
+#endif
+
+ sigemptyset (&blocked_sigs);
+# if defined (SIGCHLD)
+ sigaddset (&blocked_sigs, SIGCHLD);
+# endif
+
+#if defined (HAVE_PSELECT)
+ ts.tv_sec = sec;
+ ts.tv_nsec = usec * 1000;
+#else
+ sigemptyset (&prevmask);
+ tv.tv_sec = sec;
+ tv.tv_usec = usec;
+#endif /* !HAVE_PSELECT */
+
+ do
+ {
+#if defined (HAVE_PSELECT)
+ r = pselect(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &ts, &blocked_sigs);
+#else
+ sigprocmask (SIG_SETMASK, &blocked_sigs, &prevmask);
+ r = select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
+ sigprocmask (SIG_SETMASK, &prevmask, NULL);
+#endif
+ e = errno;
+ if (r < 0 && errno == EINTR)
+ QUIT; /* just signals, no traps */
+ errno = e;
+ }
+ while (r < 0 && errno == EINTR);
+
+ return r;
+}
+#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
+int
+fsleep(sec, usec)
+ long sec, usec;
+{
+ if (usec >= 500000) /* round */
+ sec++;
+ return (sleep(sec));
+}
+#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */