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Dump O_* flags

This commit is contained in:
hjp 2016-07-05 19:22:02 +00:00
parent a5b3940dfe
commit e4f841f6c3
1 changed files with 58 additions and 0 deletions
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58
open_mode/open_mode.c Normal file
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#define _GNU_SOURCE 1
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
struct {
int mode;
char *name;
} modes[] = {
{ O_APPEND, "O_APPEND" },
{ O_ASYNC, "O_ASYNC" },
{ O_CLOEXEC, "O_CLOEXEC" },
{ O_CREAT, "O_CREAT" },
{ O_DIRECT, "O_DIRECT" },
{ O_DIRECTORY, "O_DIRECTORY" },
{ O_EXCL, "O_EXCL" },
{ O_LARGEFILE, "O_LARGEFILE" },
{ O_NOATIME, "O_NOATIME" },
{ O_NOCTTY, "O_NOCTTY" },
{ O_NOFOLLOW, "O_NOFOLLOW" },
{ O_NONBLOCK, "O_NONBLOCK" },
{ O_NDELAY, "O_NDELAY" },
{ O_SYNC, "O_SYNC" },
{ O_TRUNC, "O_TRUNC" },
};
void dump_mode(int mode) {
if ((mode & 3) == O_RDONLY) {
printf("%7o %s\n", O_RDONLY, "O_RDONLY");
} else
if ((mode & 3) == O_WRONLY) {
printf("%7o %s\n", O_WRONLY, "O_WRONLY");
} else
if ((mode & 3) == O_RDWR) {
printf("%7o %s\n", O_RDWR, "O_RDWR");
} else {
printf("%7o %s\n", (mode & 3), "none");
}
for (int i = 0; i < sizeof(modes)/sizeof(modes[0]); i++) {
if (modes[i].mode & mode) {
printf("%7o %s\n", modes[i].mode, modes[i].name);
}
}
printf("\n");
}
int main(int argc, char **argv) {
if (argc == 1) {
dump_mode(-1);
} else {
for (char **arg = argv+1; *arg; arg++) {
int mode = strtoul(*arg, NULL, 0);
dump_mode(mode);
}
}
}