Rich Felker
ba6a9e7734
- add the rest of the junk traditionally in sys/param.h - add prototypes for some nonstandard functions - add _GNU_SOURCE to their source files so the compiler can check proto
34 lines
565 B
C
34 lines
565 B
C
#define _GNU_SOURCE
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#include <fcntl.h>
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#include <unistd.h>
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int daemon(int nochdir, int noclose)
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{
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if (!nochdir && chdir("/"))
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return -1;
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if (!noclose) {
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int fd, failed = 0;
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if ((fd = open("/dev/null", O_RDWR)) < 0) return -1;
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if (dup2(fd, 0) < 0 || dup2(fd, 1) < 0 || dup2(fd, 2) < 0)
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failed++;
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if (fd > 2) close(fd);
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if (failed) return -1;
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}
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switch(fork()) {
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case 0: break;
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case -1: return -1;
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default: _exit(0);
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}
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if (setsid() < 0) return -1;
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switch(fork()) {
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case 0: break;
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case -1: return -1;
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default: _exit(0);
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}
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return 0;
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}
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