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