projet-systeme-exploitation.../utils.c

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4.6 KiB
C
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#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <setjmp.h>
#include "readcmd.h"
#include "jobs.h"
extern int errno;
extern int pid_fils;
extern int wait_code;
extern int prompting;
extern list jobs;
extern struct cmdline *cmd;
extern jmp_buf goto_prompt;
extern char initcd[];
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extern struct sigaction action;
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int builtin()
{
if (cmd == NULL)
{ // EOF
return 1;
}
else if (cmd->err)
{ // error from readcmd
fprintf(stderr, "ERROR: readcmd failed, %s\n", cmd->err);
return 2;
}
else if (cmd->seq[0] == NULL)
{ // empty
return 2;
}
else if (!strcmp(cmd->seq[0][0], "exit"))
{ // "exit"
return 1;
}
else if (!strcmp(cmd->seq[0][0], "cd"))
{ // "cd"
int ret = 0;
if (cmd->seq[0][1] == NULL)
{ // no path
ret = chdir(initcd);
}
else
{ // with path
ret = chdir(cmd->seq[0][1]);
}
if (ret)
{ // wrong path
fprintf(stderr, "ERROR: cd failed, (%d) %s\n", errno, strerror(errno));
}
return 2;
}
else if (!strcmp(cmd->seq[0][0], "jobs"))
{ // "jobs"
afficher(&jobs);
return 2;
}
else if (!strcmp(cmd->seq[0][0], "bg"))
{ // "bg"
cell *job;
if (cmd->seq[0][1] == NULL)
{ // no id
fprintf(stderr, "ERROR: id missing\n");
return 2;
}
else
{ // id specified
job = trouver_id(&jobs, atoi(cmd->seq[0][1]));
}
kill(job->pid, SIGCONT);
pause();
return 2;
}
else if (!strcmp(cmd->seq[0][0], "fg"))
{ // "fg"
cell *job;
if (cmd->seq[0][1] == NULL)
{ // no id
fprintf(stderr, "ERROR: id missing\n");
return 2;
}
else
{ // id specified
job = trouver_id(&jobs, atoi(cmd->seq[0][1]));
pid_fils = job->pid;
}
kill(pid_fils, SIGCONT);
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printf("[%d] %d running: %s\n", job->id, job->pid, job->cmd);
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pause();
waitpid(pid_fils, NULL, 0);
return 2;
}
else if (!strcmp(cmd->seq[0][0], "stop"))
{ // "stop"
cell *job;
if (cmd->seq[0][1] == NULL)
{ // no id
fprintf(stderr, "ERROR: id missing\n");
return 2;
}
else
{ // id specified
job = trouver_id(&jobs, atoi(cmd->seq[0][1]));
}
kill(job->pid, SIGSTOP);
pause();
return 2;
}
else if (!strcmp(cmd->seq[0][0], "pid"))
{ // "pid"
printf("pid=%d\n", getpid());
return 2;
}
return 0;
}
void handler_sigchld(int sig_num)
{
do
{
pid_fils = waitpid(-1, &wait_code, WNOHANG | WUNTRACED | WCONTINUED);
if ((pid_fils == -1) && (errno != ECHILD))
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{ // wait failed ?
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fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", pid_fils, errno, strerror(errno));
exit(errno);
}
cell *job = trouver(&jobs, pid_fils);
if (job != NULL)
{
if (prompting)
{
printf("\n");
}
if (WIFSTOPPED(wait_code))
{
printf("[%d] %d stopped: %s\n", job->id, job->pid, job->cmd);
}
else if (WIFCONTINUED(wait_code))
{
printf("[%d] %d continued: %s\n", job->id, job->pid, job->cmd);
if (!strcmp(cmd->seq[0][0], "fg"))
{
supprimer(&jobs, job->pid);
}
}
else if (WIFEXITED(wait_code))
{
printf("[%d] %d exited: %s\n", job->id, job->pid, job->cmd);
supprimer(&jobs, job->pid);
}
else if (wait_code == SIGKILL)
{
printf("[%d] %d killed: %s\n", job->id, job->pid, job->cmd);
supprimer(&jobs, job->pid);
}
}
} while (pid_fils > 0);
if (prompting)
{
siglongjmp(goto_prompt, sig_num);
}
}
void handler_sigint(int sig_num)
{
printf("\n");
if (!prompting)
{
kill(pid_fils, SIGKILL);
pause();
}
siglongjmp(goto_prompt, sig_num);
}
void handler_sigtstp(int sig_num)
{
printf("\n");
if (!prompting)
{
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//ajouter(&jobs, pid_fils, *(cmd->seq));
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kill(pid_fils, SIGSTOP);
pause();
}
siglongjmp(goto_prompt, sig_num);
}