tail: Use fstat in case file is removed
This commit is contained in:
parent
51e432cc44
commit
1ab4ac60ff
20
tail.c
20
tail.c
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@ -175,8 +175,8 @@ main(int argc, char *argv[])
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}
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}
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if (many)
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if (many)
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printf("%s==> %s <==\n", newline ? "\n" : "", *argv);
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printf("%s==> %s <==\n", newline ? "\n" : "", *argv);
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if (stat(*argv, &st1) < 0)
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if (fstat(fd, &st1) < 0)
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eprintf("stat %s:", *argv);
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eprintf("fstat %s:", *argv);
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if (!(S_ISFIFO(st1.st_mode) || S_ISREG(st1.st_mode)))
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if (!(S_ISFIFO(st1.st_mode) || S_ISREG(st1.st_mode)))
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fflag = 0;
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fflag = 0;
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newline = 1;
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newline = 1;
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@ -193,16 +193,14 @@ main(int argc, char *argv[])
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for (;;) {
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for (;;) {
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if (concat(fd, *argv, 1, "<stdout>") < 0)
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if (concat(fd, *argv, 1, "<stdout>") < 0)
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exit(1);
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exit(1);
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/* ignore error in case file was removed, we continue
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if (fstat(fd, &st2) < 0)
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* tracking the existing open file descriptor */
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eprintf("fstat %s:", *argv);
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if (!stat(*argv, &st2)) {
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if (st2.st_size < st1.st_size) {
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if (st2.st_size < st1.st_size) {
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fprintf(stderr, "%s: file truncated\n", *argv);
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fprintf(stderr, "%s: file truncated\n", *argv);
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if (lseek(fd, SEEK_SET, 0) < 0)
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if (lseek(fd, SEEK_SET, 0) < 0)
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eprintf("lseek:");
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eprintf("lseek:");
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}
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st1 = st2;
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}
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}
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st1 = st2;
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sleep(1);
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sleep(1);
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}
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}
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}
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}
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