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352 lines
7.2 KiB
C
352 lines
7.2 KiB
C
/*
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* This is a complete rewrite of the popen/pclose routines.
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* Devin Reade, 1997.
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*
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* $Id: popen.c,v 1.2 1997/09/21 06:04:01 gdr Exp $
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*
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* This file is formatted for tab stops every 8 columns.
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*/
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#ifdef __ORCAC__
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segment "libc_gen__";
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#endif
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <signal.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <paths.h>
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#include <sys/queue.h>
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#ifdef __GNO__
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#include <gno/gno.h>
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#endif
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#include <assert.h> /* shouldn't be necessary in final code */
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/*
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* This #define makes us create a temporary file containing the
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* commands to execute rather than giving them on the gsh command
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* line. Gsh has a problem with accepting command line arguments ...
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*/
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#define USE_SCRIPT 1
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/*
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* We maintain state information by having a linked list of these
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* structs.
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*/
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static SLIST_HEAD(popenStateHead, popenEntry_t) popenHead;
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static struct popenStateHead *popenHeadPtr = NULL;
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typedef struct popenEntry_t {
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SLIST_ENTRY(popenEntry_t) pr_link; /* link */
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FILE *pr_fp; /* the FILE pointer */
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pid_t pr_pid; /* pid of the child */
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#ifdef USE_SCRIPT
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char *pr_name; /* name of the "script" file */
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#endif
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} popenEntry_t;
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#ifdef USE_SCRIPT
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/*
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* _popen_script -- create a temporary file of type EXEC that contains
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* the set of commands that we will execute. This
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* is a Real Kludge to get around a problem with gsh
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* ignoring it's command line flags (-c in particular).
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*/
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static char *
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_popen_script (const char *command) {
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/* the number of chars in prefix comes from "popen<pid>":
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* "popen" 5
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* <pid> up to 6 (for a 16-bit pid)
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* null 1
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*/
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char prefix[12];
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char *result;
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FILE *fp;
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int i;
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#ifdef __GNO__
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int oldEmulate;
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#endif
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sprintf(prefix, "popen%u", getpid());
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if ((result = tempnam(NULL, prefix)) == NULL) {
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return NULL;
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}
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if ((fp = fopen(result, "w")) == NULL) {
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free(result);
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return NULL;
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}
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fprintf(fp, "%s\n", command);
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fclose(fp);
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/* change file/aux type to SRC/EXEC */
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#ifdef __GNO__
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oldEmulate = _setModeEmulation (1);
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#endif
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i = chmod(result, S_IRWXU);
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#ifdef __GNO__
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_setModeEmulation(oldEmulate);
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#endif
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if (i == -1) {
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i = errno;
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free(result);
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errno = i;
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result = NULL;
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}
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return result;
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}
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#endif /* USE_SCRIPT */
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#pragma optimize 78 /* bits 3 and 6, minimum */
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#pragma debug 0
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/* change this when we have an sh(1) for GNO */
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#ifdef __GNO__
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#define SHELL_PATH _PATH_GSHELL
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#define SHELL_NAME "gsh"
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#else
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#define SHELL_PATH _PATH_BSHELL
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#define SHELL_NAME "sh"
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#endif
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#ifdef USE_SCRIPT
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#define SH_CFLAG
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#else
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#define SH_CFLAG "-c",
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#error this is broken
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#endif
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#ifdef __GNO__
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#pragma databank 1
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static void
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_popen_child(int *pdes, char *type, char *command)
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{
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char buffer[128];
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strcpy(buffer, "/bin/gsh ");
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strcat(buffer, command);
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if (*type == 'r') {
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if (pdes[1] != STDOUT_FILENO) {
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if (dup2(pdes[1], STDOUT_FILENO) == -1) {
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_exit(126);
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}
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close(pdes[1]);
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}
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close(pdes[0]);
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} else {
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if (pdes[0] != STDIN_FILENO) {
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if (dup2(pdes[0], STDIN_FILENO) == -1 ) {
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_exit(126);
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}
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close(pdes[0]);
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}
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close(pdes[1]);
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}
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#if 0
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execl(SHELL_PATH, SHELL_NAME, SH_CFLAG command, (char *) 0);
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#else
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_execve("/bin/gsh", buffer);
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#endif
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{
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char *p;
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p = strerror(errno);
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write(STDERR_FILENO, p, strlen(p));
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write(STDERR_FILENO, "\r", 1);
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}
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_exit(127);
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}
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#pragma databank 0
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#endif /* __GNO__ */
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FILE *
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popen(const char *command, const char *type)
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{
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static int pdes[2];
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popenEntry_t *entry = NULL;
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int err;
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/* initialize the status pointer if necessary */
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if (popenHeadPtr == NULL) {
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popenHeadPtr = &popenHead;
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SLIST_INIT(popenHeadPtr);
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}
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/* verify legality of access mode */
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if ((*type != 'r' && *type != 'w') || type[1]) {
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errno = EINVAL;
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goto fail;
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}
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/* get a new status element */
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if ((entry = malloc(sizeof(popenEntry_t))) == NULL) {
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goto fail;
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}
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entry->pr_fp = NULL;
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entry->pr_pid = 0;
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#ifdef USE_SCRIPT
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entry->pr_name = NULL;
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#endif
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/* create the pipes */
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if (pipe(pdes) < 0) {
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goto fail;
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}
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#ifdef USE_SCRIPT
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if ((command = _popen_script(command)) == NULL) {
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goto fail;
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}
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entry->pr_name = (char *) command;
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#endif
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#ifdef __GNO__
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entry->pr_pid = fork2(_popen_child, 4096, 0,
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"forked child of popen", 6, pdes, type,
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command);
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switch (entry->pr_pid) {
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#else
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switch (entry->pr_pid = vfork()) {
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#endif
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case -1: /* error */
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err = errno;
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close(pdes[0]);
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close(pdes[1]);
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errno = err;
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goto fail;
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/* NOTREACHED */
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#ifndef __GNO__
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case 0: /* child */
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if (*type == 'r') {
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if (pdes[1] != STDOUT_FILENO) {
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if (dup2(pdes[1], STDOUT_FILENO) == -1) {
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_exit(126);
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}
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close(pdes[1]);
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}
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close(pdes[0]);
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} else {
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if (pdes[0] != STDIN_FILENO) {
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if (dup2(pdes[0], STDIN_FILENO) == -1 ) {
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_exit(126);
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}
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close(pdes[0]);
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}
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close(pdes[1]);
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}
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execl(SHELL_PATH, SHELL_NAME, SH_CFLAG command, (char *) 0);
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_exit(127);
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/* NOTREACHED */
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#endif /* ! __GNO__ */
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}
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/* parent */
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if (*type == 'r') {
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if ((entry->pr_fp = fdopen(pdes[0], type)) == NULL) {
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close(pdes[0]);
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}
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close(pdes[1]);
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} else {
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if ((entry->pr_fp = fdopen(pdes[1], type)) == NULL) {
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close(pdes[1]);
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}
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close(pdes[0]);
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}
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if (entry->pr_fp != NULL) {
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SLIST_INSERT_HEAD(popenHeadPtr, entry, pr_link);
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return entry->pr_fp;
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}
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/*FALLTHROUGH*/
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fail:
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/*
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* OK, so goto's are passe' -- but it reduces the size of the
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* generated code.
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*/
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if (entry) {
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err = errno;
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if (entry->pr_fp == NULL) {
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if (entry->pr_pid > 0) {
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kill(entry->pr_pid, SIGKILL);
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}
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}
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if (entry->pr_name) {
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unlink(entry->pr_name);
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free(entry->pr_name);
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}
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free(entry);
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errno = err;
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}
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return NULL;
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}
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#ifdef __GNO__
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#define WAITSTAT_TYPE union wait *
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#else
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#define WAITSTAT_TYPE int *
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#endif
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/*
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* pclose returns -1 if stream is not associated with a
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* `popened' command, if already `pclosed', or waitpid
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* returns an error.
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*/
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int
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pclose(FILE * iop)
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{
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union wait pstat;
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pid_t pid;
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popenEntry_t *np;
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if (iop == NULL || popenHeadPtr == NULL) {
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errno = EINVAL;
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return -1;
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}
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for (np = popenHeadPtr->slh_first; np != NULL;
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np = np->pr_link.sle_next) {
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if (np->pr_fp == iop) {
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break;
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}
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}
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if (np == NULL) {
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/* iop not opened by popen(3) */
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errno = EINVAL;
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return -1;
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}
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assert(np->pr_name != NULL);
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assert(np->pr_name[0] != '\0');
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SLIST_REMOVE(popenHeadPtr, np, popenEntry_t, pr_link);
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/* Close it, and wait for the child to exit. */
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fclose(iop);
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#if 1
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pid = wait((WAITSTAT_TYPE) &pstat);
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#else
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do {
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pid = waitpid(np->pr_pid, (WAITSTAT_TYPE) &pstat, 0);
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} while (pid == -1 && errno == EINTR);
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#endif
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/* clean up the structures */
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#ifdef USE_SCRIPT
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unlink(np->pr_name);
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free(np->pr_name);
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#endif
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free(np);
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return (pid == -1 ? -1 : pstat.w_retcode);
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}
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