chiark / gitweb /
use WRITE_END/READ_END for the pipe index
[elogind.git] / udev_utils_run.c
index 0ee36d6..1315154 100644 (file)
@@ -130,57 +130,57 @@ int run_program(const char *command, const char *subsystem,
        switch(pid) {
        case 0:
                /* child closes parent ends of pipes */
-               if (outpipe[0] > 0)
-                       close(outpipe[0]);
-               if (errpipe[0] > 0)
-                       close(errpipe[0]);
+               if (outpipe[READ_END] > 0)
+                       close(outpipe[READ_END]);
+               if (errpipe[READ_END] > 0)
+                       close(errpipe[READ_END]);
 
                /* discard child output or connect to pipe */
                devnull = open("/dev/null", O_RDWR);
                if (devnull > 0) {
                        dup2(devnull, STDIN_FILENO);
-                       if (outpipe[1] < 0)
+                       if (outpipe[WRITE_END] < 0)
                                dup2(devnull, STDOUT_FILENO);
-                       if (errpipe[1] < 0)
+                       if (errpipe[WRITE_END] < 0)
                                dup2(devnull, STDERR_FILENO);
                        close(devnull);
                } else
                        err("open /dev/null failed");
-               if (outpipe[1] > 0)
-                       dup2(outpipe[1], STDOUT_FILENO);
-               if (errpipe[1] > 0)
-                       dup2(errpipe[1], STDERR_FILENO);
+               if (outpipe[WRITE_END] > 0)
+                       dup2(outpipe[WRITE_END], STDOUT_FILENO);
+               if (errpipe[WRITE_END] > 0)
+                       dup2(errpipe[WRITE_END], STDERR_FILENO);
                execv(argv[0], argv);
 
                /* we should never reach this */
-               err("exec of program failed");
+               err("exec of program '%s' failed", argv[0]);
                _exit(1);
        case -1:
                err("fork of '%s' failed", argv[0]);
                return -1;
        default:
                /* read from child if requested */
-               if (outpipe[0] > 0 || errpipe[0] > 0) {
+               if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
                        ssize_t count;
                        size_t respos = 0;
 
                        /* parent closes child ends of pipes */
-                       if (outpipe[1] > 0)
-                               close(outpipe[1]);
-                       if (errpipe[1] > 0)
-                               close(errpipe[1]);
+                       if (outpipe[WRITE_END] > 0)
+                               close(outpipe[WRITE_END]);
+                       if (errpipe[WRITE_END] > 0)
+                               close(errpipe[WRITE_END]);
 
                        /* read child output */
-                       while (outpipe[0] > 0 || errpipe[0] > 0) {
+                       while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
                                int fdcount;
                                fd_set readfds;
 
                                FD_ZERO(&readfds);
-                               if (outpipe[0] > 0)
-                                       FD_SET(outpipe[0], &readfds);
-                               if (errpipe[0] > 0)
-                                       FD_SET(errpipe[0], &readfds);
-                               fdcount = select(UDEV_MAX(outpipe[0], errpipe[0])+1, &readfds, NULL, NULL, NULL);
+                               if (outpipe[READ_END] > 0)
+                                       FD_SET(outpipe[READ_END], &readfds);
+                               if (errpipe[READ_END] > 0)
+                                       FD_SET(errpipe[READ_END], &readfds);
+                               fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
                                if (fdcount < 0) {
                                        if (errno == EINTR)
                                                continue;
@@ -189,15 +189,15 @@ int run_program(const char *command, const char *subsystem,
                                }
 
                                /* get stdout */
-                               if (outpipe[0] > 0 && FD_ISSET(outpipe[0], &readfds)) {
+                               if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
                                        char inbuf[1024];
                                        char *pos;
                                        char *line;
 
-                                       count = read(outpipe[0], inbuf, sizeof(inbuf)-1);
+                                       count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
                                        if (count <= 0) {
-                                               close(outpipe[0]);
-                                               outpipe[0] = -1;
+                                               close(outpipe[READ_END]);
+                                               outpipe[READ_END] = -1;
                                                if (count < 0) {
                                                        err("stdin read failed with '%s'", strerror(errno));
                                                        retval = -1;
@@ -223,15 +223,15 @@ int run_program(const char *command, const char *subsystem,
                                }
 
                                /* get stderr */
-                               if (errpipe[0] > 0 && FD_ISSET(errpipe[0], &readfds)) {
+                               if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
                                        char errbuf[1024];
                                        char *pos;
                                        char *line;
 
-                                       count = read(errpipe[0], errbuf, sizeof(errbuf)-1);
+                                       count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
                                        if (count <= 0) {
-                                               close(errpipe[0]);
-                                               errpipe[0] = -1;
+                                               close(errpipe[READ_END]);
+                                               errpipe[READ_END] = -1;
                                                if (count < 0)
                                                        err("stderr read failed with '%s'", strerror(errno));
                                                continue;
@@ -243,10 +243,10 @@ int run_program(const char *command, const char *subsystem,
                                                        info("'%s' (stderr) '%s'", argv[0], line);
                                }
                        }
-                       if (outpipe[0] > 0)
-                               close(outpipe[0]);
-                       if (errpipe[0] > 0)
-                               close(errpipe[0]);
+                       if (outpipe[READ_END] > 0)
+                               close(outpipe[READ_END]);
+                       if (errpipe[READ_END] > 0)
+                               close(errpipe[READ_END]);
 
                        /* return the childs stdout string */
                        if (result) {