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20 lines
383 B
C
20 lines
383 B
C
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "open.h"
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int open_lock(const char *fn)
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{
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#ifdef O_CLOEXEC
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int fd = open(fn,O_RDWR | O_CLOEXEC);
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if (fd == -1) return -1;
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#else
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int fd = open(fn,O_RDWR);
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if (fd == -1) return -1;
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fcntl(fd,F_SETFD,1);
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#endif
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if (lockf(fd,F_LOCK,0) == -1) { close(fd); return -1; }
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return fd;
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}
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