102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <string.h>
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#include <errno.h>
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#include "exec.h"
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#include "log.h"
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void argv_dump(const char **argv) {
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int i = 0;
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while (argv[i]) {
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printf(" %2d: '%s'\n", i, argv[i]);
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i++;
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}
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}
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static int arg_count(const char **argv) {
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int count = 0;
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while (*argv) {
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count++;
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argv++;
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}
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return count;
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}
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static void argv_free(char** argv) {
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char **cur = argv;
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while (*cur) {
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free(*cur);
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cur++;
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}
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free(argv);
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}
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static char **argv_dup(const char **argv) {
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int argc = arg_count(argv);
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char **result = calloc(1, sizeof(char*) * (argc + 1));
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if (!result) {
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log_libc(LLVL_ERROR, "malloc(3) failed in argv_dup");
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return NULL;
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}
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result[argc - 1] = NULL;
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for (int i = 0; i < argc; i++) {
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result[i] = strdup(argv[i]);
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if (!result[i]) {
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log_libc(LLVL_ERROR, "strdup(3) failed in argv_dup");
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argv_free(result);
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return NULL;
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}
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}
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return result;
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}
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struct runresult_t exec_command(const char **argv) {
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struct runresult_t runresult;
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char **argvcopy = argv_dup(argv);
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memset(&runresult, 0, sizeof(runresult));
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pid_t pid = fork();
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if (pid == -1) {
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perror("fork");
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runresult.success = false;
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argv_free(argvcopy);
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return runresult;
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}
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if (pid == 0) {
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/* Child */
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const bool silent = true;
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if (silent) {
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/* Shut up the child if user did not request debug output */
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close(1);
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close(2);
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}
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execvp(argvcopy[0], argvcopy);
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log_libc(LLVL_ERROR, "Execution of %s in forked child process failed execvp(3)", argvcopy[0]);
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/* Exec failed, terminate chExec failed, terminate child process
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* (parent will catch this as the return code) */
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exit(EXIT_FAILURE);
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}
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int status;
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if (waitpid(pid, &status, 0) == (pid_t)-1) {
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log_libc(LLVL_ERROR, "exec_command %s failed executing waitpid(2)", argvcopy[0]);
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runresult.success = false;
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runresult.returncode = -1;
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} else {
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runresult.success = true;
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runresult.returncode = WEXITSTATUS(status);
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}
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argv_free(argvcopy);
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log_msg(LLVL_DEBUG, "Subprocess (PID %d): %s %s returned %d", pid, argv[0], runresult.success ? "successfully" : "unsuccessfully", runresult.returncode);
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return runresult;
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}
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