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|
$NetBSD: patch-ar,v 1.1 2005/06/14 18:10:37 jlam Exp $
--- /dev/null 2005-06-14 01:17:00.000000000 -0400
+++ lib/s_popen.c 2005-06-14 00:03:23.000000000 -0400
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2004 The X.Org fundation
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is fur-
+ * nished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of the X.Org fundation
+ * shall not be used in advertising or otherwise to promote the sale,
+ * use or other dealings in this Software without prior written
+ * authorization from the X.Org fundation.
+ */
+
+/*
+** This is a secure but NOT 100% compatible replacement for popen()
+** Note: - don't use pclose() use fclose() for closing the returned
+** filedesc.!!!
+**
+** Known Bugs: - unable to use i/o-redirection like > or <
+** Author: - Thomas Biege <thomas@suse.de>
+** Credits: - Andreas Pfaller <a.pfaller@pop.gun.de> for fixing a SEGV when
+** calling strtok()
+*/
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#define __SEC_POPEN_TOKEN " "
+
+FILE *s_popen(char *cmd, const char *type)
+{
+ pid_t pid;
+ int pfd[2];
+ int rpipe = 0, wpipe = 0, i;
+ char **argv;
+ char *ptr;
+ char *cmdcpy;
+
+
+ if(cmd == NULL || cmd == "")
+ return(NULL);
+
+ if(type[0] != 'r' && type[0] != 'w')
+ return(NULL);
+
+ if ((cmdcpy = strdup(cmd)) == NULL)
+ return(NULL);
+
+ argv = NULL;
+ if( (ptr = strtok(cmdcpy, __SEC_POPEN_TOKEN)) == NULL)
+ {
+ free(cmdcpy);
+ return(NULL);
+ }
+
+ for(i = 0;; i++)
+ {
+ if( ( argv = (char **) realloc(argv, (i+1) * sizeof(char *)) ) == NULL)
+ {
+ free(cmdcpy);
+ return(NULL);
+ }
+
+ if( (*(argv+i) = (char *) malloc((strlen(ptr)+1) * sizeof(char))) == NULL)
+ {
+ free(cmdcpy);
+ return(NULL);
+ }
+
+ strcpy(argv[i], ptr);
+
+ if( (ptr = strtok(NULL, __SEC_POPEN_TOKEN)) == NULL)
+ {
+ if( ( argv = (char **) realloc(argv, (i+2) * sizeof(char *))) == NULL)
+ {
+ free(cmdcpy);
+ return(NULL);
+ }
+ argv[i+1] = NULL;
+ break;
+ }
+ }
+
+
+ if(type[0] == 'r')
+ rpipe = 1;
+ else
+ wpipe = 1;
+
+ if (pipe(pfd) < 0)
+ {
+ free(cmdcpy);
+ return(NULL);
+ }
+
+ if((pid = fork()) < 0)
+ {
+ close(pfd[0]);
+ close(pfd[1]);
+ free(cmdcpy);
+ return(NULL);
+ }
+
+ if(pid == 0) /* child */
+ {
+ if((pid = fork()) < 0)
+ {
+ close(pfd[0]);
+ close(pfd[1]);
+ free(cmdcpy);
+ return(NULL);
+ }
+ if(pid > 0)
+ {
+ exit(0); /* child nr. 1 exits */
+ }
+
+ /* child nr. 2 */
+ if(rpipe)
+ {
+ close(pfd[0]); /* close reading end, we don't need it */
+ dup2(STDOUT_FILENO, STDERR_FILENO);
+ if (pfd[1] != STDOUT_FILENO)
+ dup2(pfd[1], STDOUT_FILENO); /* redirect stdout to writing end of pipe */
+ }
+ else
+ {
+ close(pfd[1]); /* close writing end, we don't need it */
+ if (pfd[0] != STDIN_FILENO)
+ dup2(pfd[0], STDIN_FILENO); /* redirect stdin to reading end of pipe */
+ }
+
+ if(strchr(argv[0], '/') == NULL)
+ execvp(argv[0], argv); /* search in $PATH */
+ else
+ execv(argv[0], argv);
+
+ close(pfd[0]);
+ close(pfd[1]);
+ free(cmdcpy);
+ return(NULL); /* exec failed.. ooops! */
+ }
+ else /* parent */
+ {
+ waitpid(pid, NULL, 0); /* wait for child nr. 1 */
+
+ if(rpipe)
+ {
+ close(pfd[1]);
+ free(cmdcpy);
+ return(fdopen(pfd[0], "r"));
+ }
+ else
+ {
+ close(pfd[0]);
+ free(cmdcpy);
+ return(fdopen(pfd[1], "w"));
+ }
+
+ }
+}
+
|
