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Annotation of src/usr.bin/make/cmd_exec.c, Revision 1.2

1.1       espie       1: /*     $OpenPackages$ */
1.2     ! mickey      2: /*     $OpenBSD: cmd_exec.c,v 1.1 2001/05/23 12:34:40 espie Exp $ */
1.1       espie       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 */
1.2     ! mickey     72:     switch (cpid = fork()) {
1.1       espie      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: