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#define _XOPEN_SOURCE 700
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define NOHUP_UTILITY_NOT_FOUND 127
#define NOHUP_UTILITY_NOT_INVOKED 126
int main(int argc, char *argv[])
{
int c;
setlocale(LC_ALL, "");
while ((c = getopt(argc, argv, "")) != -1) {
switch (c) {
default:
return 1;
}
}
argv += optind;
if (argv[0] == NULL) {
fprintf(stderr, "nohup: utility required\n");
return NOHUP_UTILITY_NOT_INVOKED;
}
signal(SIGHUP, SIG_IGN);
if (isatty(STDOUT_FILENO)) {
char out[FILENAME_MAX] = "nohup.out";
int fd = open(out, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
if (fd == -1) {
char *home = getenv("HOME");
if (home == NULL) {
fprintf(stderr, "nohup: $HOME unset\n");
return NOHUP_UTILITY_NOT_INVOKED;
}
snprintf(out, sizeof(out), "%s/nohup.out", home);
fd = open(out, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
if (fd == -1) {
perror("nohup: couldn't open nohup.out or $HOME/nohup.out");
return NOHUP_UTILITY_NOT_INVOKED;
}
}
fprintf(stderr, "nohup: appending to %s\n", out);
dup2(fd, STDOUT_FILENO);
}
if (isatty(STDERR_FILENO)) {
dup2(STDOUT_FILENO, STDERR_FILENO);
}
execvp(argv[0], argv);
perror("nohup");
if (errno == ENOENT) {
return NOHUP_UTILITY_NOT_FOUND;
}
return NOHUP_UTILITY_NOT_INVOKED;
}
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