79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2013 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/* gtm_pipe.c
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Parameters --
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command : the command to be executed.
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pt : type of the pipe (input or output)
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Returns --
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-1 : fork error
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-2 : pipe() error
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other : the file descriptor serving as one end of the pipe
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*/
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#include "mdef.h"
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#include <sys/types.h>
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#include "gtm_fcntl.h"
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#include "gtm_stat.h"
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#include "gtm_stdio.h"
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#include "gtm_unistd.h"
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#include "gtm_stdlib.h"
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#include "gtm_pipe.h"
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#include "eintr_wrappers.h"
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#include "gtmio.h"
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#include "fork_init.h"
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GBLDEF uint4 pipe_child;
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int gtm_pipe(char *command, pipe_type pt)
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{
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int pfd[2], child, parent;
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int dup2_res, rc;
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pid_t child_pid;
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parent = (int)pt;
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child = 1 - parent;
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if (0 > pipe(pfd))
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{
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PERROR("pipe : ");
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return -2;
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}
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FORK(child_pid); /* BYPASSOK: we exit immediately, no FORK_CLEAN needed */
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if (-1 == child_pid)
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{
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PERROR("fork : ");
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return -1;
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} else if (0 == child_pid)
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{ /* child process */
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CLOSEFILE_RESET(pfd[parent], rc); /* resets "pfd[parent]" to FD_INVALID */
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DUP2(pfd[child], child, dup2_res);
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CLOSEFILE_RESET(pfd[child], rc); /* resets "pfd[child]" to FD_INVALID */
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/* We should have used exec instead of SYSTEM. Earlier it was followed by exit(EXIT_SUCCESS), which calls
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* exit_handler. So both child and parent will do exit handling. This can make ref_cnt < 0, or, it can release
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* semaphores, which we should not release until parent exists. So we just call _exit(EXIT_SUCCESS). Add the do
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* nothing if to keep compiler happy since exiting anyway.
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*/
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rc = SYSTEM(command);
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_exit(EXIT_SUCCESS); /* just exit from here */
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} else
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{ /* parent process */
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pipe_child = child_pid;
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CLOSEFILE_RESET(pfd[child], rc); /* resets "pfd[child]" to FD_INVALID */
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return pfd[parent];
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}
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}
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