Annotation of src/usr.bin/make/cmd_exec.c, Revision 1.11
1.11 ! espie 1: /* $OpenBSD: cmd_exec.c,v 1.10 2016/03/28 11:27:37 chl Exp $ */
1.1 espie 2: /*
3: * Copyright (c) 2001 Marc Espie.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
15: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
18: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include <sys/types.h>
28: #include <sys/wait.h>
29: #include <errno.h>
30: #include <stdio.h>
31: #include <unistd.h>
32: #include "config.h"
33: #include "defines.h"
34: #include "cmd_exec.h"
35: #include "buf.h"
36: #include "memory.h"
37: #include "pathnames.h"
1.11 ! espie 38: #include "job.h"
1.1 espie 39:
40: char *
1.5 espie 41: Cmd_Exec(const char *cmd, char **err)
1.1 espie 42: {
1.6 espie 43: char *args[4]; /* Args for invoking the shell */
44: int fds[2]; /* Pipe streams */
45: pid_t cpid; /* Child PID */
46: char *result; /* Result */
47: int status; /* Command exit status */
48: BUFFER buf; /* Buffer to store the result. */
49: char *cp; /* Pointer into result. */
50: ssize_t cc; /* Characters read from pipe. */
51: size_t length; /* Total length of result. */
52:
53:
54: *err = NULL;
55:
56: /* Set up arguments for the shell. */
57: args[0] = "sh";
58: args[1] = "-c";
59: args[2] = (char *)cmd;
60: args[3] = NULL;
61:
62: /* Open a pipe for retrieving shell's output. */
63: if (pipe(fds) == -1) {
64: *err = "Couldn't create pipe for \"%s\"";
65: goto bad;
1.3 millert 66: }
1.1 espie 67:
1.6 espie 68: /* Fork */
69: switch (cpid = fork()) {
70: case 0:
1.11 ! espie 71: reset_signal_mask();
1.6 espie 72: /* Close input side of pipe */
73: (void)close(fds[0]);
74:
75: /* Duplicate the output stream to the shell's output, then
76: * shut the extra thing down. Note we don't fetch the error
77: * stream: user can use redirection to grab it as this goes
78: * through /bin/sh.
79: */
80: if (fds[1] != 1) {
81: (void)dup2(fds[1], 1);
82: (void)close(fds[1]);
83: }
84:
85: (void)execv(_PATH_BSHELL, args);
86: _exit(1);
87: /*NOTREACHED*/
88:
89: case -1:
90: *err = "Couldn't exec \"%s\"";
91: goto bad;
92:
93: default:
94: /* No need for the writing half. */
95: (void)close(fds[1]);
96:
97: Buf_Init(&buf, MAKE_BSIZE);
98:
99: do {
100: char grab[BUFSIZ];
101:
102: cc = read(fds[0], grab, sizeof(grab));
103: if (cc > 0)
104: Buf_AddChars(&buf, cc, grab);
105: } while (cc > 0 || (cc == -1 && errno == EINTR));
106:
107: /* Close the input side of the pipe. */
108: (void)close(fds[0]);
109:
110: /* Wait for the child to exit. */
1.9 espie 111: while (waitpid(cpid, &status, 0) == -1 && errno == EINTR)
1.6 espie 112: continue;
113:
114: if (cc == -1)
115: *err = "Couldn't read shell's output for \"%s\"";
116:
117: if (status)
118: *err = "\"%s\" returned non-zero status";
119:
120: length = Buf_Size(&buf);
121: result = Buf_Retrieve(&buf);
122:
123: /* The result is null terminated, Convert newlines to spaces. */
124: cp = result + length - 1;
125:
126: if (cp >= result && *cp == '\n')
127: /* A final newline is just stripped. */
128: *cp-- = '\0';
129:
130: while (cp >= result) {
131: if (*cp == '\n')
132: *cp = ' ';
133: cp--;
134: }
135: break;
1.1 espie 136: }
1.6 espie 137: return result;
138: bad:
139: return estrdup("");
1.1 espie 140: }
141:
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