glibc/sysdeps/unix/alarm.c

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1995-02-18 02:27:10 +01:00
/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <unistd.h>
#include <sys/time.h>
/* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
If SECONDS is zero, any currently scheduled alarm will be cancelled.
The function returns the number of seconds remaining until the last
alarm scheduled would have signaled, or zero if there wasn't one.
There is no return value to indicate an error, but you can set `errno'
to 0 and check its value after calling `alarm', and this might tell you.
The signal may come late due to processor scheduling. */
unsigned int
DEFUN(alarm, (seconds), unsigned int seconds)
{
struct itimerval old, new;
Tue Mar 19 14:18:42 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * sysdeps/unix/bsd/pause.c: Moved to sysdeps/unix/common/pause.c. Mon Mar 4 20:17:28 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/adjtime.c: Use INT_MAX instead of LONG_MAX. * sysdeps/unix/sysv/Makefile (sysdep_routines): Don't add s_getdents. * sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Don't add mount, umount. * sysdeps/alpha/__math.h (atan, cabs): New functions. * sysdeps/unix/sysv/linux/alpha/sigsuspend.S: new file (syscall expects set-value, not pointer to it). Sun Feb 25 22:36:10 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/profil-counter.h: New file. * gmon/gmon.c (__bb_head): new variable. (write_hist, write_call_graph, write_bb_counts): new functions. (_mcleanup): modified to call above functions instead of directly writing out gmon.out. * gmon/sys/gmon.h (struct __bb): New type. (struct gmonhdr): Type removed. (struct gmonparam): New member `log_hashfraction'. (GMONVERSION): Macro removed. * gmon/sys/gmon_out.h, gmon/bb_exit_func.c, sysdeps/generic/bb_init_func.c, sysdeps/alpha/bb_init_func.S: new files. * gmon/Makefile (headers): Add sys/gmon_out.h. (routines): Add bb_init_func, bb_exit_func. * gmon/mcount.c: Avoid integer division. Wed Feb 21 23:56:41 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/alpha/setjmp.S: switched order in which sp and fp are passed to match what __sigsetjmp_aux() expects. Tue Feb 20 11:33:46 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/syscalls.list (select, bind, connect, getpeername, getsockname, listen, recv, recvfrom, recvmsg, send, sendmsg, sendto, setsockopt, shutdown, socketpair): added to override same-name assembly file in the parent directory. * stdlib/stdlib.h: add include of sys/types.h in front of random etc declarations to ensure int32_t is declared. * stdlib/random.c, stdlib/random_r.c: replaced "long int" by int32_t where 32 bit integers are required. Also change LONG_MAX into 0x7fffffff since the intent is to turn off the sign bit in a 32 bit integer. * time/offtime.c (__offtime): Use Paul Eggert's code to deal with very large values for "days" (e.g., 64 bit values). Mon Feb 19 22:22:12 1996 David Mosberger-Tang <davidm@azstarnet.com> * stdlib/stdlib.h (__random, __random_r, random_r, struct random_data): use int32_t instead of `long int'. Sat Feb 17 11:29:29 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/ioperm.c: new file. * sysdeps/alpha/ffs.S: new file. * sysdeps/alpha/fabs.c: File removed. * time/tzfile.c (__tzfile_read): counter variable is i, *not* num_transitions! * time/offtime.c: make capable of dealing with very large (64 bit) time_t values. Use old algorithm until a year is reached that is an integer multiple of 400, then use DAYS_PER_400_YEARS to do the remainder in a single division. * sysdeps/generic/ffs.c (ffs): fix variable declarations to be unsigned int, not unsigned long. * string/test-ffs.c (main): add test case with all upper bits set. * stdlib/tst-strtol.c: add tests cases for machines where sizeof(long)==8. * stdlib/testrand.c (main): disallow rand() to return negative integers. * stdlib/testmb.c (main): fix format to use %lx instead of %x. * stdlib/stdlib.h: on 64 bit machines, declare struct random_data, __random(), __random_r, and random_r to return "int" instead of "long int". * stdlib/random_r.c: 64 bit machines use "int" instead of "long int". Similarly, use INT_MAX instead of LONG_MAX. * stdlib/random.c: on 64 bit machines, randtbl[] and __random[] need to operate on "int" instead of "long int". * locale/locfile-hash.c (compute_hashval): make shifted constant a long to avoid loosing bits on 64 bit machines. * dirent/tst-seekdir.c (main): fix confusing comment; print a line to mark point where directory is rewound. Fri Feb 16 15:01:49 1996 David Mosberger-Tang <davidm@azstarnet.com> * time/strftime.c (strftime): any hour > 11 is PM (not > 12!). Wed Feb 14 00:21:17 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/Makefile, sysdeps/unix/sysv/linux/alpha/brk.S, sysdeps/unix/sysv/linux/alpha/fpu_control.c, sysdeps/unix/sysv/linux/alpha/fpu_control.h, sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S, sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S, sysdeps/unix/sysv/linux/alpha/pipe.S, sysdeps/unix/sysv/linux/alpha/setfpucw.c, sysdeps/unix/sysv/linux/alpha/sigprocmask.c, sysdeps/unix/sysv/linux/alpha/speed.c, sysdeps/unix/sysv/linux/alpha/start.S, sysdeps/unix/sysv/linux/alpha/syscall.S, sysdeps/unix/sysv/linux/alpha/syscalls.list, sysdeps/unix/sysv/linux/alpha/alpha/regdef.h, sysdeps/unix/sysv/linux/alpha/sysdep.S, sysdeps/unix/sysv/linux/alpha/sysdep.h: New files. * sysdeps/alpha/setjmp_aux.c (__sigsetjmp_aux): restore return address register before returning (gcc 2.7.1 doesn't do it, presumably because $26 is declared as a global variable). * sysdeps/unix/sysv/linux/sys/mman.h: msync was missing "flags" argument. * sysdeps/unix/alarm.c (alarm): do roundup using test & increment instead of multiplication. * sysdeps/posix/sleep.c (sleep): initialize sa_mask to mask of currently blocked signals instead of the empty mask to ensure that execution of alarm handler occurs with none of the currently blocked signals enabled. * sysdeps/unix/alpha/sysdep.h: new file (adapted from OSF/1 version). * sysdeps/unix/bsd/osf/alpha/sysdep.h: include sysdeps/unix/alpha/sysdep.h and removed definitions now in that file. * sysdeps/alpha/divrem.S, sysdeps/alpha/htonl.S, sysdeps/alpha/htons.S, sysdeps/alpha/machine-gmon.h, sysdeps/alpha/_mcount.S, sysdeps/alpha/ntohl.s, sysdeps/alpha/ntohs.s, sysdeps/alpha/strlen.S: New files. * sysdeps/alpha/divl.S, sysdeps/alpha/divlu.S, sysdeps/alpha/divq.S, sysdeps/alpha/divqu.S, sysdeps/alpha/divrem.m4, sysdeps/alpha/macros.m4, sysdeps/alpha/reml.S, sysdeps/alpha/remlu.S, sysdeps/alpha/remq.S, sysdeps/alpha/remqu.S, sysdeps/alpha/strlen.c: Removed. * sysdeps/generic/sbrk.c (__sbrk): argument is of type ptrdiff_t, not int. * sysdeps/alpha/__longjmp.c (__longjmp): moved dummy while loop to end of function to avoid a jump across NOPs. * sysdeps/alpha/Makefile (sysdep_routines): Removed all rules pertaining to integer division/remainder routines since new code doesn't require them. * sunrpc/xdr_mem.c, sunrpc/xdr_stdio.c: Use 4 instead of sizeof(long) where 32 bit quantities are consumed/stored. Various other minor 64-bit cleanups (casting). * sunrpc/xdr.c (xdr_int): test for sizeof(int)==4 to determine whether xdr_long or xdr_short should be used to encode an int. Notice that an xdr_long is 4 bytes independent of the architecture (otherwise no Alpha could interoperate with existing NFS servers, for example). Ditto for enums. * sunrpc/svc_udp.c (svcudp_recv): changed test from 4*sizeof(u_long) to 16 since it really wants 16 bytes. * sunrpc/svc.c (maskp): changed from u_long* to u_int32*. * sunrpc/rpc_cmsg.c (xdr_callmsg), sunrpc/svc_authux.c: increment "buf" pointer by casting it to a char* first since a long* may be 8 bytes or more and oa->oa_length may be any multiple of 4. * sunrpc/rpc/xdr.h (IXDR_GET_LONG, IXDR_PUT_LONG): change casts to u_int32_t (instead of u_long). * sunrpc/clnt_udp.c (clntudp_call): replaced sizeof(u_long) by 4 since it really is testing for 32 bits. Fixed casts to use u_int32 instead of u_long. * sunrpc/xdr_rec.c: Likewise. * sunrpc/clnt_tcp.c (clnttcp_call): replaced u_long by u_int32. * sunrpc/rpc/auth.h: Likewise. * limits.h (LONG_MAX, LONG_MIN, ULONG_MAX): use 64 bit values for Alpha. Tue Mar 19 13:27:49 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * sysdeps/i386/fpu/__math.h: New file. Contributed by John C. Bowman <bowman@hagar.ph.utexas.edu>. Sun Mar 17 00:28:16 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/posix/clock.c: Don't multiply the return value by CLOCKS_PER_SEC or CLK_TCK. * sysdeps/mach/hurd/getcwd.c: Fail with ENOENT if a parent directory scan finds no match. * posix/unistd.h (setpgrp): Declare no-arg version unless __FAVOR_BSD. * misc/bsd-compat.c (setpgrp): New function, two arg version. * sysdeps/stub/setpgid.c: Remove setpgrp alias. * sysdeps/mach/hurd/setpgid.c: Likewise. * sysdeps/unix/sysv/sysv4/setpgid.c: Likewise. * sysdeps/unix/common/syscalls.list (setpgid): Remove setpgrp alias. * sysdeps/unix/sysv/irix4/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/setpgrp.c: Obsolete file removed. * posix/setpgrp.c (setpgrp): New file. * posix/Makefile (routines): Add setpgrp. Tue Feb 6 12:46:29 1996 David Mosberger-Tang <davidm@azstarnet.com> * libc-symbols.h (weak_alias, weak_symbol): added definitions for ECOFF (HAVE_ECOFF).
1996-03-19 21:21:54 +01:00
unsigned int retval;
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new.it_interval.tv_usec = 0;
new.it_interval.tv_sec = 0;
new.it_value.tv_usec = 0;
new.it_value.tv_sec = (long int) seconds;
if (__setitimer(ITIMER_REAL, &new, &old) < 0)
return 0;
Tue Mar 19 14:18:42 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * sysdeps/unix/bsd/pause.c: Moved to sysdeps/unix/common/pause.c. Mon Mar 4 20:17:28 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/adjtime.c: Use INT_MAX instead of LONG_MAX. * sysdeps/unix/sysv/Makefile (sysdep_routines): Don't add s_getdents. * sysdeps/unix/sysv/linux/Makefile (sysdep_routines): Don't add mount, umount. * sysdeps/alpha/__math.h (atan, cabs): New functions. * sysdeps/unix/sysv/linux/alpha/sigsuspend.S: new file (syscall expects set-value, not pointer to it). Sun Feb 25 22:36:10 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/profil-counter.h: New file. * gmon/gmon.c (__bb_head): new variable. (write_hist, write_call_graph, write_bb_counts): new functions. (_mcleanup): modified to call above functions instead of directly writing out gmon.out. * gmon/sys/gmon.h (struct __bb): New type. (struct gmonhdr): Type removed. (struct gmonparam): New member `log_hashfraction'. (GMONVERSION): Macro removed. * gmon/sys/gmon_out.h, gmon/bb_exit_func.c, sysdeps/generic/bb_init_func.c, sysdeps/alpha/bb_init_func.S: new files. * gmon/Makefile (headers): Add sys/gmon_out.h. (routines): Add bb_init_func, bb_exit_func. * gmon/mcount.c: Avoid integer division. Wed Feb 21 23:56:41 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/alpha/setjmp.S: switched order in which sp and fp are passed to match what __sigsetjmp_aux() expects. Tue Feb 20 11:33:46 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/syscalls.list (select, bind, connect, getpeername, getsockname, listen, recv, recvfrom, recvmsg, send, sendmsg, sendto, setsockopt, shutdown, socketpair): added to override same-name assembly file in the parent directory. * stdlib/stdlib.h: add include of sys/types.h in front of random etc declarations to ensure int32_t is declared. * stdlib/random.c, stdlib/random_r.c: replaced "long int" by int32_t where 32 bit integers are required. Also change LONG_MAX into 0x7fffffff since the intent is to turn off the sign bit in a 32 bit integer. * time/offtime.c (__offtime): Use Paul Eggert's code to deal with very large values for "days" (e.g., 64 bit values). Mon Feb 19 22:22:12 1996 David Mosberger-Tang <davidm@azstarnet.com> * stdlib/stdlib.h (__random, __random_r, random_r, struct random_data): use int32_t instead of `long int'. Sat Feb 17 11:29:29 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/ioperm.c: new file. * sysdeps/alpha/ffs.S: new file. * sysdeps/alpha/fabs.c: File removed. * time/tzfile.c (__tzfile_read): counter variable is i, *not* num_transitions! * time/offtime.c: make capable of dealing with very large (64 bit) time_t values. Use old algorithm until a year is reached that is an integer multiple of 400, then use DAYS_PER_400_YEARS to do the remainder in a single division. * sysdeps/generic/ffs.c (ffs): fix variable declarations to be unsigned int, not unsigned long. * string/test-ffs.c (main): add test case with all upper bits set. * stdlib/tst-strtol.c: add tests cases for machines where sizeof(long)==8. * stdlib/testrand.c (main): disallow rand() to return negative integers. * stdlib/testmb.c (main): fix format to use %lx instead of %x. * stdlib/stdlib.h: on 64 bit machines, declare struct random_data, __random(), __random_r, and random_r to return "int" instead of "long int". * stdlib/random_r.c: 64 bit machines use "int" instead of "long int". Similarly, use INT_MAX instead of LONG_MAX. * stdlib/random.c: on 64 bit machines, randtbl[] and __random[] need to operate on "int" instead of "long int". * locale/locfile-hash.c (compute_hashval): make shifted constant a long to avoid loosing bits on 64 bit machines. * dirent/tst-seekdir.c (main): fix confusing comment; print a line to mark point where directory is rewound. Fri Feb 16 15:01:49 1996 David Mosberger-Tang <davidm@azstarnet.com> * time/strftime.c (strftime): any hour > 11 is PM (not > 12!). Wed Feb 14 00:21:17 1996 David Mosberger-Tang <davidm@azstarnet.com> * sysdeps/unix/sysv/linux/alpha/Makefile, sysdeps/unix/sysv/linux/alpha/brk.S, sysdeps/unix/sysv/linux/alpha/fpu_control.c, sysdeps/unix/sysv/linux/alpha/fpu_control.h, sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S, sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S, sysdeps/unix/sysv/linux/alpha/pipe.S, sysdeps/unix/sysv/linux/alpha/setfpucw.c, sysdeps/unix/sysv/linux/alpha/sigprocmask.c, sysdeps/unix/sysv/linux/alpha/speed.c, sysdeps/unix/sysv/linux/alpha/start.S, sysdeps/unix/sysv/linux/alpha/syscall.S, sysdeps/unix/sysv/linux/alpha/syscalls.list, sysdeps/unix/sysv/linux/alpha/alpha/regdef.h, sysdeps/unix/sysv/linux/alpha/sysdep.S, sysdeps/unix/sysv/linux/alpha/sysdep.h: New files. * sysdeps/alpha/setjmp_aux.c (__sigsetjmp_aux): restore return address register before returning (gcc 2.7.1 doesn't do it, presumably because $26 is declared as a global variable). * sysdeps/unix/sysv/linux/sys/mman.h: msync was missing "flags" argument. * sysdeps/unix/alarm.c (alarm): do roundup using test & increment instead of multiplication. * sysdeps/posix/sleep.c (sleep): initialize sa_mask to mask of currently blocked signals instead of the empty mask to ensure that execution of alarm handler occurs with none of the currently blocked signals enabled. * sysdeps/unix/alpha/sysdep.h: new file (adapted from OSF/1 version). * sysdeps/unix/bsd/osf/alpha/sysdep.h: include sysdeps/unix/alpha/sysdep.h and removed definitions now in that file. * sysdeps/alpha/divrem.S, sysdeps/alpha/htonl.S, sysdeps/alpha/htons.S, sysdeps/alpha/machine-gmon.h, sysdeps/alpha/_mcount.S, sysdeps/alpha/ntohl.s, sysdeps/alpha/ntohs.s, sysdeps/alpha/strlen.S: New files. * sysdeps/alpha/divl.S, sysdeps/alpha/divlu.S, sysdeps/alpha/divq.S, sysdeps/alpha/divqu.S, sysdeps/alpha/divrem.m4, sysdeps/alpha/macros.m4, sysdeps/alpha/reml.S, sysdeps/alpha/remlu.S, sysdeps/alpha/remq.S, sysdeps/alpha/remqu.S, sysdeps/alpha/strlen.c: Removed. * sysdeps/generic/sbrk.c (__sbrk): argument is of type ptrdiff_t, not int. * sysdeps/alpha/__longjmp.c (__longjmp): moved dummy while loop to end of function to avoid a jump across NOPs. * sysdeps/alpha/Makefile (sysdep_routines): Removed all rules pertaining to integer division/remainder routines since new code doesn't require them. * sunrpc/xdr_mem.c, sunrpc/xdr_stdio.c: Use 4 instead of sizeof(long) where 32 bit quantities are consumed/stored. Various other minor 64-bit cleanups (casting). * sunrpc/xdr.c (xdr_int): test for sizeof(int)==4 to determine whether xdr_long or xdr_short should be used to encode an int. Notice that an xdr_long is 4 bytes independent of the architecture (otherwise no Alpha could interoperate with existing NFS servers, for example). Ditto for enums. * sunrpc/svc_udp.c (svcudp_recv): changed test from 4*sizeof(u_long) to 16 since it really wants 16 bytes. * sunrpc/svc.c (maskp): changed from u_long* to u_int32*. * sunrpc/rpc_cmsg.c (xdr_callmsg), sunrpc/svc_authux.c: increment "buf" pointer by casting it to a char* first since a long* may be 8 bytes or more and oa->oa_length may be any multiple of 4. * sunrpc/rpc/xdr.h (IXDR_GET_LONG, IXDR_PUT_LONG): change casts to u_int32_t (instead of u_long). * sunrpc/clnt_udp.c (clntudp_call): replaced sizeof(u_long) by 4 since it really is testing for 32 bits. Fixed casts to use u_int32 instead of u_long. * sunrpc/xdr_rec.c: Likewise. * sunrpc/clnt_tcp.c (clnttcp_call): replaced u_long by u_int32. * sunrpc/rpc/auth.h: Likewise. * limits.h (LONG_MAX, LONG_MIN, ULONG_MAX): use 64 bit values for Alpha. Tue Mar 19 13:27:49 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * sysdeps/i386/fpu/__math.h: New file. Contributed by John C. Bowman <bowman@hagar.ph.utexas.edu>. Sun Mar 17 00:28:16 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/posix/clock.c: Don't multiply the return value by CLOCKS_PER_SEC or CLK_TCK. * sysdeps/mach/hurd/getcwd.c: Fail with ENOENT if a parent directory scan finds no match. * posix/unistd.h (setpgrp): Declare no-arg version unless __FAVOR_BSD. * misc/bsd-compat.c (setpgrp): New function, two arg version. * sysdeps/stub/setpgid.c: Remove setpgrp alias. * sysdeps/mach/hurd/setpgid.c: Likewise. * sysdeps/unix/sysv/sysv4/setpgid.c: Likewise. * sysdeps/unix/common/syscalls.list (setpgid): Remove setpgrp alias. * sysdeps/unix/sysv/irix4/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/setpgrp.c: Obsolete file removed. * posix/setpgrp.c (setpgrp): New file. * posix/Makefile (routines): Add setpgrp. Tue Feb 6 12:46:29 1996 David Mosberger-Tang <davidm@azstarnet.com> * libc-symbols.h (weak_alias, weak_symbol): added definitions for ECOFF (HAVE_ECOFF).
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retval = old.it_value.tv_sec;
if (old.it_value.tv_usec)
++retval;
return retval;
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}