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author | Matt Strapp <matt@mattstrapp.net> | 2022-05-24 11:18:46 -0500 |
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committer | Matt Strapp <matt@mattstrapp.net> | 2022-05-24 11:19:55 -0500 |
commit | 7a73162607544204032aa66cce755daf21edebda (patch) | |
tree | 58578e01f15f34a855d99c32898db9d7a1603e67 /csci5271/hw1/hw1p2b.c | |
parent | do some stuff (diff) | |
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Graduate
Signed-off-by: Matt Strapp <matt@mattstrapp.net>
Diffstat (limited to 'csci5271/hw1/hw1p2b.c')
-rw-r--r-- | csci5271/hw1/hw1p2b.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/csci5271/hw1/hw1p2b.c b/csci5271/hw1/hw1p2b.c new file mode 100644 index 0000000..df5ac73 --- /dev/null +++ b/csci5271/hw1/hw1p2b.c @@ -0,0 +1,28 @@ +#include <fcntl.h> +#include <stdlib.h> +#include <sys/stat.h> +#include <unistd.h> +void silly_function(char *pathname) { + struct stat f, we; + int rfd, wfd; + char *buf; + stat(pathname, &f); + stat("./critical", &we); + if (f.st_dev == we.st_dev && f.st_ino == we.st_ino) { + return; + } + rfd = open(pathname, O_RDONLY); + buf = malloc(f.st_size - 1); + read(rfd, buf, f.st_size - 1); + close(rfd); + stat(pathname, &f); + if (f.st_dev == we.st_dev && f.st_ino == we.st_ino) { + return; + } + wfd = open(pathname, O_WRONLY | O_TRUNC); + write(wfd, buf, f.st_size - 1); + close(wfd); + free(buf); +} + +int main() { silly_function("./not"); }
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