chiark / gitweb /
make ATTR{[$SUBSYSTEM/$KERNEL]<attr>}="<value>" working
[elogind.git] / udev_utils_run.c
index 1315154..1a92cdd 100644 (file)
@@ -1,6 +1,4 @@
 /*
- * udev_utils_run.c - execute programs from udev and read its output
- *
  * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
  *
  *     This program is free software; you can redistribute it and/or modify it
@@ -14,7 +12,7 @@
  * 
  *     You should have received a copy of the GNU General Public License along
  *     with this program; if not, write to the Free Software Foundation, Inc.,
- *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  */
 
 #include <sys/wait.h>
 #include <sys/select.h>
 
-#include "udev_libc_wrapper.h"
 #include "udev.h"
-#include "logging.h"
-#include "udev_utils.h"
-#include "list.h"
 
+extern char **environ;
 
 int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
 {
@@ -53,7 +48,7 @@ int pass_env_to_socket(const char *sockname, const char *devpath, const char *ac
        sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
        memset(&saddr, 0x00, sizeof(struct sockaddr_un));
        saddr.sun_family = AF_LOCAL;
-       /* only abstract namespace is supported */
+       /* abstract namespace only */
        strcpy(&saddr.sun_path[1], sockname);
        addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 
@@ -82,20 +77,23 @@ int run_program(const char *command, const char *subsystem,
        int errpipe[2] = {-1, -1};
        pid_t pid;
        char arg[PATH_SIZE];
+       char program[PATH_SIZE];
        char *argv[(sizeof(arg) / 2) + 1];
        int devnull;
        int i;
 
+       /* build argv from comand */
        strlcpy(arg, command, sizeof(arg));
        i = 0;
-       if (strchr(arg, ' ')) {
+       if (strchr(arg, ' ') != NULL) {
                char *pos = arg;
+
                while (pos != NULL) {
                        if (pos[0] == '\'') {
                                /* don't separate if in apostrophes */
                                pos++;
                                argv[i] = strsep(&pos, "\'");
-                               while (pos && pos[0] == ' ')
+                               while (pos != NULL && pos[0] == ' ')
                                        pos++;
                        } else {
                                argv[i] = strsep(&pos, " ");
@@ -104,28 +102,33 @@ int run_program(const char *command, const char *subsystem,
                        i++;
                }
                argv[i] = NULL;
-               info("'%s'", command);
        } else {
                argv[0] = arg;
-               argv[1] = (char *) subsystem;
-               argv[2] = NULL;
-               info("'%s' '%s'", arg, argv[1]);
+               argv[1] = NULL;
        }
+       info("'%s'", command);
 
        /* prepare pipes from child to parent */
        if (result || log) {
                if (pipe(outpipe) != 0) {
-                       err("pipe failed");
+                       err("pipe failed: %s", strerror(errno));
                        return -1;
                }
        }
        if (log) {
                if (pipe(errpipe) != 0) {
-                       err("pipe failed");
+                       err("pipe failed: %s", strerror(errno));
                        return -1;
                }
        }
 
+       /* allow programs in /lib/udev called without the path */
+       if (strchr(argv[0], '/') == NULL) {
+               strlcpy(program, "/lib/udev/", sizeof(program));
+               strlcat(program, argv[0], sizeof(program));
+               argv[0] = program;
+       }
+
        pid = fork();
        switch(pid) {
        case 0:
@@ -145,18 +148,26 @@ int run_program(const char *command, const char *subsystem,
                                dup2(devnull, STDERR_FILENO);
                        close(devnull);
                } else
-                       err("open /dev/null failed");
-               if (outpipe[WRITE_END] > 0)
+                       err("open /dev/null failed: %s", strerror(errno));
+               if (outpipe[WRITE_END] > 0) {
                        dup2(outpipe[WRITE_END], STDOUT_FILENO);
-               if (errpipe[WRITE_END] > 0)
+                       close(outpipe[WRITE_END]);
+               }
+               if (errpipe[WRITE_END] > 0) {
                        dup2(errpipe[WRITE_END], STDERR_FILENO);
+                       close(errpipe[WRITE_END]);
+               }
                execv(argv[0], argv);
-
-               /* we should never reach this */
-               err("exec of program '%s' failed", argv[0]);
+               if (errno == ENOENT || errno == ENOTDIR) {
+                       /* may be on a filesytem which is not mounted right now */
+                       info("program '%s' not found", argv[0]);
+               } else {
+                       /* other problems */
+                       err("exec of program '%s' failed", argv[0]);
+               }
                _exit(1);
        case -1:
-               err("fork of '%s' failed", argv[0]);
+               err("fork of '%s' failed: %s", argv[0], strerror(errno));
                return -1;
        default:
                /* read from child if requested */
@@ -199,7 +210,7 @@ int run_program(const char *command, const char *subsystem,
                                                close(outpipe[READ_END]);
                                                outpipe[READ_END] = -1;
                                                if (count < 0) {
-                                                       err("stdin read failed with '%s'", strerror(errno));
+                                                       err("stdin read failed: %s", strerror(errno));
                                                        retval = -1;
                                                }
                                                continue;
@@ -233,7 +244,7 @@ int run_program(const char *command, const char *subsystem,
                                                close(errpipe[READ_END]);
                                                errpipe[READ_END] = -1;
                                                if (count < 0)
-                                                       err("stderr read failed with '%s'", strerror(errno));
+                                                       err("stderr read failed: %s", strerror(errno));
                                                continue;
                                        }
                                        errbuf[count] = '\0';