mirror of
https://github.com/9fans/plan9port.git
synced 2025-01-15 11:20:03 +00:00
48 lines
817 B
C
48 lines
817 B
C
#define _GNU_SOURCE /* for Linux O_DIRECT */
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#include <u.h>
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#define NOPLAN9DEFINES
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#include <sys/file.h>
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#include <libc.h>
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#ifndef O_DIRECT
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#define O_DIRECT 0
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#endif
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int
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p9open(char *name, int mode)
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{
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int cexec, rclose;
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int fd, umode, lock, rdwr;
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rdwr = mode&3;
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umode = rdwr;
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cexec = mode&OCEXEC;
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rclose = mode&ORCLOSE;
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lock = mode&OLOCK;
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mode &= ~(3|OCEXEC|ORCLOSE|OLOCK);
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if(mode&OTRUNC){
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umode |= O_TRUNC;
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mode ^= OTRUNC;
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}
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if(mode&ODIRECT){
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umode |= O_DIRECT;
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mode ^= ODIRECT;
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}
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if(mode){
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werrstr("mode 0x%x not supported", mode);
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return -1;
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}
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fd = open(name, umode);
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if(fd >= 0){
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if(lock){
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if(flock(fd, (rdwr==OREAD) ? LOCK_SH : LOCK_EX) < 0){
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close(fd);
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return -1;
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}
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}
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if(cexec)
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fcntl(fd, F_SETFL, FD_CLOEXEC);
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if(rclose)
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remove(name);
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}
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return fd;
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}
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