ref: 4dbb99f478d68eaeea4c043a839454cb807c2c7d
dir: /sys/src/cmd/aux/dial.c/
#include <u.h> #include <libc.h> int eflag; int nopts; char *opts[16]; void xfer(int from, int to) { char buf[IOUNIT]; int n; while((n = read(from, buf, sizeof buf)) > 0) if(write(to, buf, n) < 0) break; } void usage(void) { fprint(2, "usage: %s [-e] [-o msg]... addr [cmd [args]...]\n", argv0); exits("usage"); } void main(int argc, char *argv[]) { int i, fd, cfd, pid; ARGBEGIN { case 'e': eflag = 1; break; case 'o': if(nopts >= nelem(opts)){ fprint(2, "%s: too many -o options\n", argv0); exits("opts"); } opts[nopts++] = EARGF(usage()); break; default: usage(); } ARGEND; if(--argc < 0) usage(); fd = dial(*argv++, nil, nil, &cfd); if(fd < 0){ fprint(2, "%s: dial: %r\n", argv0); exits("dial"); } for(i = 0; i < nopts; i++) write(cfd, opts[i], strlen(opts[i])); close(cfd); if(argc > 0){ dup(fd, 0); dup(fd, 1); /* dup(fd, 2); keep stderr */ if(fd > 2) close(fd); exec(argv[0], argv); if(argv[0][0] != '/') exec(smprint("/bin/%s", argv[0]), argv); fprint(2, "%s: exec: %r\n", argv0); exits("exec"); } pid = fork(); switch(pid){ case -1: fprint(2, "%s: fork: %r", argv0); exits("fork"); case 0: xfer(0, fd); if(eflag) exits(nil); pid = getppid(); break; default: xfer(fd, 1); break; } postnote(PNPROC, pid, "kill"); waitpid(); exits(nil); }