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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| #include <stdio.h> | ||
| #include <sys/types.h> | ||
| #include <sys/wait.h> | ||
| #include <unistd.h> | ||
| #include <errno.h> | ||
|
|
||
| int main(void) { | ||
| printf("Main program started\n"); | ||
|
|
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| int pid = vfork(); | ||
| if (pid == -1) { | ||
| printf("failed to fork - %d", errno); | ||
| return 1; | ||
| } | ||
|
|
||
| if (pid == 0) { | ||
| printf("execve: echo hi-from-child\n"); | ||
| char* argv[] = { "echo", "hi-from-child", NULL }; | ||
| char* envp[] = { NULL }; | ||
| if (execve("echo", argv, envp) == -1) { | ||
| perror("Could not execve"); | ||
| } | ||
| } else { | ||
| int status = 0; | ||
| waitpid(pid, &status, 0); | ||
| printf("Child(%d) exited with %d\n", pid, status); | ||
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| printf("execve: echo hi-from-parent\n"); | ||
| char* argv[] = { "echo", "hi-from-parent", NULL }; | ||
| char* envp[] = { NULL }; | ||
| if (execve("echo", argv, envp) == -1) { | ||
| perror("Could not execve"); | ||
| } | ||
| } | ||
|
|
||
| return 1; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
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| #include <unistd.h> | ||
| #include <spawn.h> | ||
| #include <sys/wait.h> | ||
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| extern char **environ; | ||
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| int main(int argc, char* argv[]) | ||
| { | ||
| pid_t pid; | ||
| char *child_argv[] = {"echo", "hi", NULL}; | ||
| int status; | ||
| status = posix_spawn(&pid, "echo", NULL, NULL, child_argv, environ); | ||
| if (status == 0) { | ||
| printf("Child pid: %i\n", pid); | ||
| do { | ||
| if (waitpid(pid, &status, 0) != -1) { | ||
| printf("Child status %d\n", WEXITSTATUS(status)); | ||
| } else { | ||
| perror("waitpid"); | ||
| exit(1); | ||
| } | ||
| } while (!WIFEXITED(status) && !WIFSIGNALED(status)); | ||
| } else { | ||
| printf("posix_spawn: %s\n", strerror(status)); | ||
| } | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| #include <stdio.h> | ||
| #include <sys/types.h> | ||
| #include <sys/wait.h> | ||
| #include <unistd.h> | ||
| #include <errno.h> | ||
|
|
||
| int main() { | ||
| int pid = vfork(); | ||
| if (pid == -1) { | ||
| printf("failed to fork - %d", errno); | ||
| return 1; | ||
| } | ||
|
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||
| if (pid == 0) | ||
| _exit(10); | ||
| else { | ||
| printf("Parent waiting on Child(%d)\n", pid); | ||
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| int status = 0; | ||
| waitpid(pid, &status, 0); | ||
| printf("Child(%d) exited with %d\n", pid, status); | ||
| } | ||
| return 0; | ||
| } |
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