Test cases of dup() for radix tree__alloc_fd

I have written the test case for dup( ).

This is dup( ) functionality test case. The dup( ) use for duplicate the file descriptor.
This test case covers below different scenarios:

* Duplicate file descriptor five times one by one.

* Fill up all file descriptor table and try to duplicate a file descriptor. dup( ) should not be succeeded.

* Give invalid file descriptor to the dup( ). dup( ) should be failed.

* Check inode number after passing newfd and oldfd to fstat( ). inode number should be same.
 Upon successful execution this program will return zero value, otherwise, it will return -1.

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#include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include <time.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <errno.h> int maxfd; int dup_fd(int count) { int fd[count],i; char buf[15]; for(i = 0; i < count; i++) { sprintf(buf, “test/myfile%d”, i); fd[i] = open(buf, O_CREAT | O_RDWR, 0644); printf(“open: %d\n”, fd[i]); if(fd[i] == -1) { printf(“open() failed…\n”); return -1; } fd [i+1] = dup(i); if (fd [i+1] == -1) { printf(“dup() failed…\n”); return -1; } printf(“dup: %d\n”, fd [i+1]); } return 0; } void close_fd(int count) { int i; for (i = 3; i < count; i++) { close(i); } } void unlink_files(int count) { char buf[15]; int i; for(i = 0; i < count; i++) { sprintf(buf,”test/myfile%d”,i); unlink(buf); } } int max_fd_dup() { int *fd, i; int ret; char buf[15]; maxfd = getdtablesize(); /* get descriptor table size */ fd = malloc(maxfd * sizeof(int)); /* allocate the memory */ printf(“maxfd = %d\n”,maxfd); for (i = 0; i < (maxfd-3); i++) { sprintf(buf, “test/myfile%d”, i); fd[i] = open(buf, O_CREAT | O_RDWR, 0644); if (fd[i] == -1) { printf(“max_fd_dup() :: open() failed…\n”); return -1; } } printf(“here *****************\n”); ret = dup(10); /* duplicate the file descriptor */ if(ret == -1) printf(“max_fd_dup: tc : pass\n”); else printf(“max_fd_dup: tc : fail\n”); return 0; } int dup_misc_tc() { int *fd, i, maxfd; struct stat buf1, buf2; char buf[20]; int ret, oldfd, newfd; ret = dup(10); if (ret == -1) { printf(“dup_misc_tc1 : pass\n”); } else { printf(“dup_misc_tc1 : fail\n”); } ret = dup(-1); if (ret == -1) { printf(“dup_misc_tc2 : pass\n”); } else { printf(“dup_misc_tc2 : fail\n”); } oldfd = open(“test/file1”, O_CREAT | O_RDWR, 0644); if(oldfd == -1) { printf(“dup_misc_tc() : open() failed…\n”); return -1; } newfd = dup(oldfd); if(newfd == -1) { printf(“dup_misc_tc() : dup() failed…\n”); return -1; } ret = fstat(oldfd, &buf1); /* get the file status */ if(ret == -1) { printf(“dup_misc_tc() : fstat() failed…\n”); return -1; } ret = fstat(newfd, &buf2); if(ret == -1) { printf(“dup_misc_tc() : fstat() failed…\n”); return -1; } printf(“buf1.st_ino = %d\n”,buf1.st_ino); printf(“buf2.st_ino = %d\n”,buf2.st_ino); if(buf1.st_ino == buf2.st_ino) printf(“dup_misc_tc3 : pass\n”); else printf(“dup_misc_tc3 : fail\n”); close(oldfd); close(newfd); unlink(“test/file1”); return 0; } int main(int argc, char **argv) { int err = 0; char *name; if(argc < 2) { printf(“usage: %s <tcNum> \n”, argv[0]); printf(“provide options to program as tc1, tc2, tc3 etc\n”); return -1; } name = argv[1]; if(strcmp(name, “tc1”) == 0) { err = dup_fd(5); if (err == -1) { return -1; } close_fd(10); unlink_files(5); } else if(strcmp(name, “tc2”) == 0) { max_fd_dup(); close_fd(maxfd-3); unlink_files(maxfd); } else if(strcmp(name, “tc3”) == 0) { dup_misc_tc(); } else printf(“Invalid option \n”); return 0; }