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Diffstat (limited to 'winsup/testsuite/libltp/lib/forker.c')
| -rw-r--r-- | winsup/testsuite/libltp/lib/forker.c | 286 |
1 files changed, 0 insertions, 286 deletions
diff --git a/winsup/testsuite/libltp/lib/forker.c b/winsup/testsuite/libltp/lib/forker.c deleted file mode 100644 index 99bc58550..000000000 --- a/winsup/testsuite/libltp/lib/forker.c +++ /dev/null @@ -1,286 +0,0 @@ -/* - * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. - * - * Further, this software is distributed without any warranty that it is - * free of the rightful claim of any third person regarding infringement - * or the like. Any license provided herein, whether implied or - * otherwise, applies only to this software file. Patent licenses, if - * any, provided herein do not apply to combinations of this program with - * other software, or any other product whatsoever. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write the Free Software Foundation, Inc., 59 - * Temple Place - Suite 330, Boston MA 02111-1307, USA. - * - * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, - * Mountain View, CA 94043, or: - * - * http://www.sgi.com - * - * For further information regarding this notice, see: - * - * http://oss.sgi.com/projects/GenInfo/NoticeExplan/ - */ -/************************************************************** - * - * OS Testing - Silicon Graphics, Inc. - * - * FUNCTION NAME : forker - * background - * - * FUNCTION TITLE : fork desired number of copies of the current process - * fork a process and return control to caller - * - * SYNOPSIS: - * int forker(ncopies, mode, prefix) - * int ncopies; - * int mode; - * char *prefix; - * - * int background(prefix); - * char *prefix; - * - * extern int Forker_pids[]; - * extern int Forker_npids; - * - * AUTHOR : Richard Logan - * - * CO-PILOT(s) : Dean Roehrich - * - * INITIAL RELEASE : UNICOS 8.0 - * - * DESIGN DESCRIPTION - * The background function will do a fork of the current process. - * The parent process will then exit, thus orphaning the - * child process. Doing this will not nice the child process - * like executing a cmd in the background using "&" from the shell. - * If the fork fails and prefix is not NULL, a error message is printed - * to stderr and the process will exit with a value of errno. - * - * The forker function will fork <ncopies> minus one copies - * of the current process. There are two modes in how the forks - * will be done. Mode 0 (default) will have all new processes - * be childern of the parent process. Using Mode 1, - * the parent process will have one child and that child will - * fork the next process, if necessary, and on and on. - * The forker function will return the number of successful - * forks. This value will be different for the parent and each child. - * Using mode 0, the parent will get the total number of successful - * forks. Using mode 1, the newest child will get the total number - * of forks. The parent will get a return value of 1. - * - * The forker function also updates the global variables - * Forker_pids[] and Forker_npids. The Forker_pids array will - * be updated to contain the pid of each new process. The - * Forker_npids variable contains the number of entries - * in Forker_pids. Note, not all processes will have - * access to all pids via Forker_pids. If using mode 0, only the - * parent process and the last process will have all information. - * If using mode 1, only the last child process will have all information. - * - * If the prefix parameter is not NULL and the fork system call fails, - * a error message will be printed to stderr. The error message - * the be preceeded with prefix string. If prefix is NULL, - * no error message is printed. - * - * SPECIAL REQUIREMENTS - * None. - * - * UPDATE HISTORY - * This should contain the description, author, and date of any - * "interesting" modifications (i.e. info should helpful in - * maintaining/enhancing this module). - * username description - * ---------------------------------------------------------------- - * rrl This functions will first written during - * the SFS testing days, 1993. - * - * BUGS/LIMITATIONS - * The child pids are stored in the fixed array, Forker_pids. - * The array only has space for 4098 pids. Only the first - * 4098 pids will be stored in the array. - * - **************************************************************/ - -#include <stdio.h> -#include <errno.h> -#include <unistd.h> /* fork, getpid, sleep */ -#include <string.h> -#include <stdlib.h> -#include "forker.h" - -extern int errno; - -int Forker_pids[FORKER_MAX_PIDS]; /* holds pids of forked processes */ -int Forker_npids=0; /* number of entries in Forker_pids */ - -/*********************************************************************** - * - * This function will fork and the parent will exit zero and - * the child will return. This will orphan the returning process - * putting it in the background. - * - * Return Value - * 0 : if fork did not fail - * !0 : if fork failed, the return value will be the errno. - ***********************************************************************/ -int -background(prefix) -char *prefix; -{ - switch (fork()) { - case -1: - if ( prefix != NULL ) - fprintf(stderr, "%s: In %s background(), fork() failed, errno:%d %s\n", - prefix, __FILE__, errno, strerror(errno)); - exit(errno); - - case 0: /* child process */ - break; - - default: - exit(0); - } - - return 0; - -} /* end of background */ - -/*********************************************************************** - * Forker will fork ncopies-1 copies of self. - * - ***********************************************************************/ -int -forker(ncopies, mode, prefix) -int ncopies; -int mode; /* 0 - all childern of parent, 1 - only 1 direct child */ -char *prefix; /* if ! NULL, an message will be printed to stderr */ - /* if fork fails. The prefix (program name) will */ - /* preceed the message */ -{ - int cnt; - int pid; - static int ind = 0; - - Forker_pids[ind]=0; - - for ( cnt=1; cnt < ncopies; cnt++ ) { - - switch ( mode ) { - case 1 : /* only 1 direct child */ - if ( (pid = fork()) == -1 ) { - if ( prefix != NULL ) - fprintf(stderr, "%s: %s,forker(): fork() failed, errno:%d %s\n", - prefix, __FILE__, errno, strerror(errno)); - return 0; - } - Forker_npids++; - - switch (pid ) { - case 0: /* child - continues the forking */ - - if ( Forker_npids < FORKER_MAX_PIDS ) - Forker_pids[Forker_npids-1]=getpid(); - break; - - default: /* parent - stop the forking */ - if ( Forker_npids < FORKER_MAX_PIDS ) - Forker_pids[Forker_npids-1]=pid; - return cnt-1; - } - - break; - - default : /* all new processes are childern of parent */ - if ( (pid = fork()) == -1 ) { - if ( prefix != NULL ) - fprintf(stderr, "%s: %s,forker(): fork() failed, errno:%d %s\n", - prefix, __FILE__, errno, strerror(errno)); - return cnt-1; - } - Forker_npids++; - - switch (pid ) { - case 0: /* child - stops the forking */ - if ( Forker_npids < FORKER_MAX_PIDS ) - Forker_pids[Forker_npids-1]=getpid(); - return cnt; - - default: /* parent - continues the forking */ - if ( Forker_npids < FORKER_MAX_PIDS ) - Forker_pids[Forker_npids-1]=pid; - break; - } - break; - } - } - - if ( Forker_npids < FORKER_MAX_PIDS ) - Forker_pids[Forker_npids]=0; - return cnt-1; - -} /* end of forker */ - - -#if UNIT_TEST - -/* - * The following is a unit test main for the background and forker - * functions. - */ - -int -main(argc, argv) -int argc; -char **argv; -{ - int ncopies=1; - int mode=0; - int ret; - int ind; - - if ( argc == 1 ) { - printf("Usage: %s ncopies [mode]\n", argv[0]); - exit(1); - } - - if ( sscanf(argv[1], "%i", &ncopies) != 1 ) { - printf("%s: ncopies argument must be integer\n", argv[0]); - exit(1); - } - - if ( argc == 3 ) - if ( sscanf(argv[2], "%i", &mode) != 1 ) { - printf("%s: mode argument must be integer\n", argv[0]); - exit(1); - } - - printf("Starting Pid = %d\n", getpid()); - ret=background(argv[0]); - printf("After background() ret:%d, pid = %d\n", ret, getpid()); - - ret=forker(ncopies, mode, argv[0]); - - printf("forker(%d, %d, %s) ret:%d, pid = %d, sleeping 30 seconds.\n", - ncopies, mode, argv[0], ret, getpid()); - - printf("%d My version of Forker_pids[], Forker_npids = %d\n", - getpid(), Forker_npids); - - for (ind=0; ind<Forker_npids; ind++){ - printf("%d ind:%-2d pid:%d\n", getpid(), ind, Forker_pids[ind]); - } - - sleep(30); - exit(0); -} - -#endif /* UNIT_TEST */ |