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Use non-blocking pipes

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Arun Prakash Jana 2017-07-02 20:32:38 +05:30
parent 55d916921f
commit acdc6dc0a3
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GPG key ID: A75979F35C080412
1 changed files with 18 additions and 4 deletions
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22
nnn.c
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@ -1279,25 +1279,38 @@ get_output(char *buf, size_t bytes, char *file,
pid_t pid; pid_t pid;
int pipefd[2]; int pipefd[2];
FILE *pf; FILE *pf;
int status; int tmp, flags;
char *ret = NULL; char *ret = NULL;
if (pipe(pipefd) == -1) if (pipe(pipefd) == -1)
printerr(1, "pipe(2)"); printerr(1, "pipe(2)");
for (tmp = 0; tmp < 2; ++tmp) {
/* Get previous flags */
flags = fcntl(pipefd[tmp], F_GETFL, 0);
/* Set bit for non-blocking flag */
flags |= O_NONBLOCK;
/* Change flags on fd */
fcntl(pipefd[tmp], F_SETFL, flags);
}
pid = fork(); pid = fork();
if (pid == 0) { if (pid == 0) {
/* In child */ /* In child */
close(pipefd[0]); close(pipefd[0]);
dup2(pipefd[1], STDOUT_FILENO); dup2(pipefd[1], STDOUT_FILENO);
dup2(pipefd[1], STDERR_FILENO); dup2(pipefd[1], STDERR_FILENO);
close(pipefd[1]);
execlp(file, file, arg1, arg2, NULL); execlp(file, file, arg1, arg2, NULL);
_exit(1); _exit(1);
} }
/* In parent */ /* In parent */
waitpid(pid, &status, 0); waitpid(pid, &tmp, 0);
close(pipefd[1]); close(pipefd[1]);
if (!pager) { if (!pager) {
pf = fdopen(pipefd[0], "r"); pf = fdopen(pipefd[0], "r");
if (pf) { if (pf) {
@ -1312,13 +1325,14 @@ get_output(char *buf, size_t bytes, char *file,
if (pid == 0) { if (pid == 0) {
/* Show in pager in child */ /* Show in pager in child */
dup2(pipefd[0], STDIN_FILENO); dup2(pipefd[0], STDIN_FILENO);
execlp("less", "less", NULL);
close(pipefd[0]); close(pipefd[0]);
execlp("less", "less", NULL);
_exit(1); _exit(1);
} }
/* In parent */ /* In parent */
waitpid(pid, &status, 0); waitpid(pid, &tmp, 0);
close(pipefd[0]);
return NULL; return NULL;
} }