sbase/nohup.c

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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include "util.h"
enum { Error = 127, Found = 126 };
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static void
usage(void)
{
eprintf("usage: %s command [argument...]\n", argv0);
}
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int
main(int argc, char *argv[])
{
int fd;
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ARGBEGIN {
default:
usage();
} ARGEND;
if(argc == 0)
usage();
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if(signal(SIGHUP, SIG_IGN) == SIG_ERR)
enprintf(Error, "signal HUP:");
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if(isatty(STDOUT_FILENO)) {
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if((fd = open("nohup.out", O_APPEND|O_CREAT,
S_IRUSR|S_IWUSR)) == -1) {
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enprintf(Error, "open nohup.out:");
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}
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if(dup2(fd, STDOUT_FILENO) == -1)
enprintf(Error, "dup2:");
close(fd);
}
if(isatty(STDERR_FILENO))
if(dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
enprintf(Error, "dup2:");
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execvp(argv[0], &argv[0]);
enprintf(errno == ENOENT ? Error : Found, "exec %s:", argv[0]);
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return Error;
}