mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-08 16:36:21 +00:00
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* Test whether /proc/{self,$PID}/path/a.out is correctly simulated. */
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#include <limits.h>
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#include <stdio.h>
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#include <strings.h>
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#include <unistd.h>
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#include <sys/fcntl.h>
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static void test_readlink(const char *cwd, const char *label,
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const char *path)
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{
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char buf[PATH_MAX];
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int n;
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if ((n = readlink(path, buf, sizeof(buf) - 1)) >= 0) {
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const char *p;
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size_t len = strlen(cwd);
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buf[n] = '\0';
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p = buf;
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if (!strncmp(buf, cwd, len))
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p += len;
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printf("Result of readlink(\"%s\"): %s\n", label, p);
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}
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else
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perror("readlink");
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}
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static void test_readlinkat(const char *cwd, const char *label,
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const char *path)
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{
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char buf[PATH_MAX];
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int n;
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if ((n = readlinkat(AT_FDCWD, path, buf, sizeof(buf) - 1)) >= 0) {
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const char *p;
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size_t len = strlen(cwd);
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buf[n] = '\0';
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p = buf;
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if (!strncmp(buf, cwd, len))
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p += len;
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printf("Result of readlinkat(\"%s\"): %s\n", label, p);
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}
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else
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perror("readlinkat");
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}
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int main(void)
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{
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char cwd[PATH_MAX];
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char path[PATH_MAX];
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cwd[0] = '\0';
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if (!getcwd(cwd, sizeof(cwd) - 1)) /* '-1' to make room for '/' */
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perror("getcwd");
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strcat(cwd, "/");
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snprintf(path, sizeof(path), "/proc/%ld/path/a.out", (long)getpid());
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test_readlink(cwd, "/proc/self/path/a.out", "/proc/self/path/a.out");
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test_readlink(cwd, "/proc/<pid>/path/a.out", path);
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test_readlinkat(cwd, "/proc/self/path/a.out", "/proc/self/path/a.out");
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test_readlinkat(cwd, "/proc/<pid>/path/a.out", path);
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return 0;
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}
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