Annotation of src/usr.bin/make/cmd_exec.c, Revision 1.1
1.1 ! espie 1: /* $OpenPackages$ */
! 2: /* $OpenBSD: main.c,v 1.15 1999/01/09 16:45:02 espie Exp $ */
! 3: /*
! 4: * Copyright (c) 2001 Marc Espie.
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: *
! 15: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
! 16: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
! 17: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
! 18: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
! 19: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
! 20: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
! 21: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
! 25: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 26: */
! 27:
! 28: #include <sys/types.h>
! 29: #include <sys/wait.h>
! 30: #include <errno.h>
! 31: #include <stdio.h>
! 32: #include <unistd.h>
! 33: #include "config.h"
! 34: #include "defines.h"
! 35: #include "cmd_exec.h"
! 36: #include "buf.h"
! 37: #include "memory.h"
! 38: #include "pathnames.h"
! 39:
! 40: char *
! 41: Cmd_Exec(cmd, err)
! 42: const char *cmd;
! 43: char **err;
! 44: {
! 45: char *args[4]; /* Args for invoking the shell */
! 46: int fds[2]; /* Pipe streams */
! 47: pid_t cpid; /* Child PID */
! 48: pid_t pid; /* PID from wait() */
! 49: char *result; /* Result */
! 50: int status; /* Command exit status */
! 51: BUFFER buf; /* Buffer to store the result. */
! 52: char *cp; /* Pointer into result. */
! 53: ssize_t cc; /* Characters read from pipe. */
! 54: size_t length; /* Total length of result. */
! 55:
! 56:
! 57: *err = NULL;
! 58:
! 59: /* Set up arguments for the shell. */
! 60: args[0] = "sh";
! 61: args[1] = "-c";
! 62: args[2] = (char *)cmd;
! 63: args[3] = NULL;
! 64:
! 65: /* Open a pipe for retrieving shell's output. */
! 66: if (pipe(fds) == -1) {
! 67: *err = "Couldn't create pipe for \"%s\"";
! 68: goto bad;
! 69: }
! 70:
! 71: /* Fork */
! 72: switch (cpid = vfork()) {
! 73: case 0:
! 74: /* Close input side of pipe */
! 75: (void)close(fds[0]);
! 76:
! 77: /* Duplicate the output stream to the shell's output, then
! 78: * shut the extra thing down. Note we don't fetch the error
! 79: * stream: user can use redirection to grab it as this goes
! 80: * through /bin/sh.
! 81: */
! 82: (void)dup2(fds[1], 1);
! 83: if (fds[1] != 1)
! 84: (void)close(fds[1]);
! 85:
! 86: (void)execv(_PATH_BSHELL, args);
! 87: _exit(1);
! 88: /*NOTREACHED*/
! 89:
! 90: case -1:
! 91: *err = "Couldn't exec \"%s\"";
! 92: goto bad;
! 93:
! 94: default:
! 95: /* No need for the writing half. */
! 96: (void)close(fds[1]);
! 97:
! 98: Buf_Init(&buf, MAKE_BSIZE);
! 99:
! 100: do {
! 101: char grab[BUFSIZ];
! 102:
! 103: cc = read(fds[0], grab, sizeof(grab));
! 104: if (cc > 0)
! 105: Buf_AddChars(&buf, cc, grab);
! 106: }
! 107: while (cc > 0 || (cc == -1 && errno == EINTR));
! 108:
! 109: /* Close the input side of the pipe. */
! 110: (void)close(fds[0]);
! 111:
! 112: /* Wait for the child to exit. */
! 113: while ((pid = wait(&status)) != cpid && pid >= 0)
! 114: continue;
! 115:
! 116: if (cc == -1)
! 117: *err = "Couldn't read shell's output for \"%s\"";
! 118:
! 119: if (status)
! 120: *err = "\"%s\" returned non-zero status";
! 121:
! 122: length = Buf_Size(&buf);
! 123: result = Buf_Retrieve(&buf);
! 124:
! 125: /* The result is null terminated, Convert newlines to spaces. */
! 126: cp = result + length - 1;
! 127:
! 128: if (*cp == '\n')
! 129: /* A final newline is just stripped. */
! 130: *cp-- = '\0';
! 131:
! 132: while (cp >= result) {
! 133: if (*cp == '\n')
! 134: *cp = ' ';
! 135: cp--;
! 136: }
! 137: break;
! 138: }
! 139: return result;
! 140: bad:
! 141: return estrdup("");
! 142: }
! 143:
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