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https://github.com/fluencelabs/musl
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6f1c1fe90c
per the text accepted for inclusion in POSIX, behavior is unspecified when any of the access mode bits are set. since it's impossible to consistently report this usage error (O_RDONLY could not be detected since its value happens to be zero), the most consistent way to handle them is just to ignore them. previously, if a caller erroneously passed O_WRONLY, the resulting access mode would be O_WRONLY|O_RDWR, which has the value 3, and this resulted in a file descriptor which rejects both read and write attempts when it is subsequently used.
32 lines
676 B
C
32 lines
676 B
C
#define _BSD_SOURCE
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include "libc.h"
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char *__randname(char *);
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int __mkostemps(char *template, int len, int flags)
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{
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size_t l = strlen(template);
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if (l<6 || len>l-6 || memcmp(template+l-len-6, "XXXXXX", 6)) {
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errno = EINVAL;
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return -1;
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}
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flags -= flags & O_ACCMODE;
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int fd, retries = 100;
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do {
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__randname(template+l-len-6);
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if ((fd = open(template, flags | O_RDWR | O_CREAT | O_EXCL, 0600))>=0)
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return fd;
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} while (--retries && errno == EEXIST);
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memcpy(template+l-len-6, "XXXXXX", 6);
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return -1;
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}
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weak_alias(__mkostemps, mkostemps);
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weak_alias(__mkostemps, mkostemps64);
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