Created
September 18, 2015 06:11
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文件描述符的O_CLOEXEC 参数
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// main.c | |
#include <stdio.h> | |
#include <unistd.h> | |
#include <fcntl.h> | |
#include <sys/socket.h> | |
static char buf[5]; | |
int main(int argc, char* argv[]) | |
{ | |
if (argc < 3) { | |
fprintf(stderr, "missing arg\n"); | |
return 1; | |
} | |
int fd = open(argv[1], O_RDWR | O_CREAT | O_APPEND, 0644); | |
if (fd < 0) { | |
perror("打开文件失败"); | |
return 2; | |
} | |
write(fd, "hello\n", 6); | |
sprintf(buf, "%d", fd); | |
printf("fd is %s\n", buf); | |
execl(argv[2], "execd", buf, NULL); | |
return 0; | |
} | |
// sub.c | |
// #include <stdio.h> | |
// #include <unistd.h> | |
// #include <stdlib.h> | |
// int main(int argc, char *argv[]) | |
// { | |
// if (argc < 2) { | |
// fprintf(stderr, "缺少参数 fd"); | |
// return 1; | |
// } | |
// int fd = (int) strtol(argv[1], NULL, 10); | |
// if (fd < 0) { | |
// fprintf(stderr, "无效的 fd: %s\n", argv[1]); | |
// return 1; | |
// } | |
// if (1 > write(fd, "\nAAA\n", 5)) { | |
// perror("fd写入失败"); | |
// return 2; | |
// } | |
// close(fd); | |
// return 0; | |
// } |
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