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Diffstat (limited to '')
-rw-r--r-- | lib/sh/ufuncs.c | 149 |
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 */ |