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https://github.com/fluencelabs/musl
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8582a6e9f2
this feature will be in the next version of POSIX, and can be used internally immediately. there are many internal uses of fopen where close-on-exec is needed to fix bugs.
36 lines
772 B
C
36 lines
772 B
C
#include "stdio_impl.h"
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FILE *fopen(const char *restrict filename, const char *restrict mode)
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{
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FILE *f;
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int fd;
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int flags;
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/* Check for valid initial mode character */
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if (!strchr("rwa", *mode)) {
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errno = EINVAL;
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return 0;
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}
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/* Compute the flags to pass to open() */
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if (strchr(mode, '+')) flags = O_RDWR;
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else if (*mode == 'r') flags = O_RDONLY;
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else flags = O_WRONLY;
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if (strchr(mode, 'x')) flags |= O_EXCL;
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if (strchr(mode, 'e')) flags |= O_CLOEXEC;
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if (*mode != 'r') flags |= O_CREAT;
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if (*mode == 'w') flags |= O_TRUNC;
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if (*mode == 'a') flags |= O_APPEND;
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fd = syscall_cp(SYS_open, filename, flags|O_LARGEFILE, 0666);
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if (fd < 0) return 0;
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f = __fdopen(fd, mode);
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if (f) return f;
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__syscall(SYS_close, fd);
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return 0;
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}
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LFS64(fopen);
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