From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/stdio/popen.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 src/stdio/popen.c (limited to 'src/stdio/popen.c') diff --git a/src/stdio/popen.c b/src/stdio/popen.c new file mode 100644 index 00000000..1d33e9d6 --- /dev/null +++ b/src/stdio/popen.c @@ -0,0 +1,43 @@ +#include "stdio_impl.h" + +FILE *popen(const char *cmd, const char *mode) +{ + int p[2]; + int op; + pid_t pid; + FILE *f; + const char *modes = "rw", *mi = strchr(modes, *mode); + + if (mi) { + op = mi-modes; + } else { + errno = EINVAL; + return 0; + } + + if (pipe(p)) return NULL; + f = fdopen(p[op], mode); + if (!f) { + close(p[0]); + close(p[1]); + return NULL; + } + + pid = fork(); + switch (pid) { + case -1: + fclose(f); + close(p[0]); + close(p[1]); + return NULL; + case 0: + dup2(p[1-op], 1-op); + close(p[0]); + close(p[1]); + execl("/bin/sh", "sh", "-c", cmd, (char *)0); + _exit(127); + } + close(p[1-op]); + f->pipe_pid = pid; + return f; +} -- cgit v1.2.1