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fork() setup initialized

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Kranklyboy 2018-04-19 22:32:40 +02:00
parent 0b5c30035b
commit 2523c18eea
1 changed files with 76 additions and 0 deletions
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76
websh.c
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@ -15,6 +15,10 @@
#include <errno.h> #include <errno.h>
#include <signal.h> #include <signal.h>
#include <sys/wait.h>
#define MAX_LEN 256
static const char *pname; static const char *pname;
static int eFlag = 0; static int eFlag = 0;
@ -107,7 +111,79 @@ int main(int argc, char *argv[])
sigaction(SIGTERM, &sa, NULL); sigaction(SIGTERM, &sa, NULL);
while (quit == 0) { while (quit == 0) {
char *line = NULL;
size_t len = 0;
ssize_t nread;
char readbuffer[MAX_LEN];
int status;
int w;
if (eFlag)
printf("<html><head></head><body>\n");
int fd[2];
pid_t childpid1;
pid_t childpid2;
pipe(fd);
while ((nread = getline(&line, &len, stdin)) != -1) {
switch (childpid1 = fork()) {
case -1:
perror(pname);
free(line);
exit(EXIT_FAILURE);
case 0:
/* CHILD ONE */
close(fd[0]);
dup2(fd[1], STDOUT_FILENO);
execl("/bin/bash", "/bin/bash", "-c", line, (char *) NULL);
fprintf(stderr, "[%s] exec failed\n", pname);
free(line);
exit(EXIT_FAILURE);
default:
/* PARENT ONE */
switch (childpid2 = fork()) {
case -1:
perror(pname);
free(line);
exit(EXIT_FAILURE);
case 0:
/* CHILD TWO */
close(fd[1]);
int nbytes = read(fd[0], readbuffer, MAX_LEN);
if (nbytes == -1) {
perror(pname);
free(line);
exit(EXIT_FAILURE);
}
printf("%s", readbuffer);
return 0;
default:
/* PARENT TWO */
do {
w = waitpid(childpid2, &status, WUNTRACED | WCONTINUED);
if (w == -1) {
perror(pname);
exit(EXIT_FAILURE);
}
if (WIFSIGNALED(status)) {
printf("Killed by signal %d\n", WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
printf("Stopped by signal %d\n", WSTOPSIG(status));
} else if (WIFCONTINUED(status)) {
printf("Continued\n");
}
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
break;
}
break;
}
}
free(line);
break;
} }
return 0; return 0;