124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
#define _XOPEN_SOURCE 500
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "sway/commands.h"
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#include "sway/config.h"
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#include "sway/tree/container.h"
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#include "sway/tree/workspace.h"
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#include "log.h"
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#include "stringop.h"
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struct cmd_results *cmd_exec_always(int argc, char **argv) {
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struct cmd_results *error = NULL;
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if (!config->active) return cmd_results_new(CMD_DEFER, NULL, NULL);
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if ((error = checkarg(argc, "exec_always", EXPECTED_MORE_THAN, 0))) {
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return error;
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}
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char *tmp = NULL;
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if (strcmp((char*)*argv, "--no-startup-id") == 0) {
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wlr_log(L_INFO, "exec switch '--no-startup-id' not supported, ignored.");
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if ((error = checkarg(argc - 1, "exec_always", EXPECTED_MORE_THAN, 0))) {
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return error;
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}
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tmp = join_args(argv + 1, argc - 1);
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} else {
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tmp = join_args(argv, argc);
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}
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// Put argument into cmd array
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char cmd[4096];
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strncpy(cmd, tmp, sizeof(cmd) - 1);
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cmd[sizeof(cmd) - 1] = 0;
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free(tmp);
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wlr_log(L_DEBUG, "Executing %s", cmd);
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int fd[2];
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if (pipe(fd) != 0) {
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wlr_log(L_ERROR, "Unable to create pipe for fork");
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}
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pid_t pid;
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pid_t *child = malloc(sizeof(pid_t)); // malloc'd so that Linux can avoid copying the process space
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if (!child) {
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return cmd_results_new(CMD_FAILURE, "exec_always", "Unable to allocate child pid");
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}
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// Fork process
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if ((pid = fork()) == 0) {
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// Fork child process again
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setsid();
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if ((*child = fork()) == 0) {
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// Acquire the current PATH
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char *path = getenv("PATH");
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const char *extra_path = ":" SWAY_LIBEXECDIR;
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const size_t extra_size = sizeof(SWAY_LIBEXECDIR) + 1;
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if (!path) {
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size_t n = confstr(_CS_PATH, NULL, 0);
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path = malloc(n + extra_size);
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if (!path) {
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wlr_log(L_ERROR, "exec_always: Unable to allocate PATH");
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exit(EXIT_FAILURE);
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}
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confstr(_CS_PATH, path, n);
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} else {
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size_t n = strlen(path) + 1;
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char *tmp = malloc(n + extra_size);
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if (!tmp) {
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wlr_log(L_ERROR, "exec_always: Unable to allocate PATH");
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exit(EXIT_FAILURE);
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}
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strncpy(tmp, path, n);
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path = tmp;
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}
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// Append /usr/lib/sway to PATH
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strcat(path, extra_path);
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if (!setenv("PATH", path, 1)) {
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free(path);
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wlr_log(L_ERROR, "exec_always: Unable to set PATH");
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exit(EXIT_FAILURE);
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}
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free(path);
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// Execute the command
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execl("/bin/sh", "/bin/sh", "-c", cmd, (void *)NULL);
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// Not reached
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}
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close(fd[0]);
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ssize_t s = 0;
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while ((size_t)s < sizeof(pid_t)) {
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s += write(fd[1], ((uint8_t *)child) + s, sizeof(pid_t) - s);
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}
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close(fd[1]);
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_exit(0); // Close child process
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} else if (pid < 0) {
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free(child);
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return cmd_results_new(CMD_FAILURE, "exec_always", "fork() failed");
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}
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close(fd[1]); // close write
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ssize_t s = 0;
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while ((size_t)s < sizeof(pid_t)) {
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s += read(fd[0], ((uint8_t *)child) + s, sizeof(pid_t) - s);
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}
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close(fd[0]);
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// cleanup child process
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wait(0);
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if (*child > 0) {
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wlr_log(L_DEBUG, "Child process created with pid %d", *child);
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// TODO: add PID to active workspace
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} else {
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free(child);
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}
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return cmd_results_new(CMD_SUCCESS, NULL, NULL);
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}
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