O_EXCL flag
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f7d8d8e357
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02d7a5293c
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@ -8,14 +8,14 @@
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int main (int argc, char *argv[]) {
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int main (int argc, char *argv[]) {
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struct stat st, s2t;
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struct stat st, s2t;
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int s = open(argv[1], O_RDONLY);
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int s = open(argv[1], O_RDONLY);
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if (s == -1) { perror("open source"); exit(1); }
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if (s == -1) { perror("open source"); exit(1); }
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int s2 = open(argv[2], O_RDONLY);
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int s2 = open(argv[2], O_RDONLY);
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if (s2 == -1) { perror("open source2"); exit(1); }
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if (s2 == -1) { perror("open source2"); exit(1); }
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if (open(argv[3], O_RDONLY) > 0) { perror("destination file exists. abort. open destfile"); exit(1); }
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int d = open(argv[3], O_RDWR | O_CREAT | O_EXCL, 0644);
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int d = open(argv[3], O_RDWR | O_CREAT, 0644);
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if (d == -1) { perror("open destination"); exit(1); }
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if (d == -1) { perror("open destination"); exit(1); }
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if (fstat(s, &st)) { perror("stat source"); exit(1); }
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if (fstat(s, &st)) { perror("stat source"); exit(1); }
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