dwm-meillo

annotate util.c @ 17:aaf520f53110

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updated README
author Anselm R. Garbe <garbeam@wmii.de>
date Tue, 11 Jul 2006 18:59:09 +0200
parents 00d4d52b231f
children 2e0fb4130bfb
rev   line source
garbeam@2 1 /*
garbeam@2 2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
garbeam@2 3 * See LICENSE file for license details.
garbeam@2 4 */
garbeam@2 5
garbeam@2 6 #include <stdarg.h>
garbeam@2 7 #include <stdio.h>
garbeam@2 8 #include <stdlib.h>
garbeam@3 9 #include <string.h>
garbeam@5 10 #include <sys/types.h>
garbeam@5 11 #include <sys/wait.h>
garbeam@5 12 #include <unistd.h>
garbeam@5 13
garbeam@5 14 #include "util.h"
garbeam@2 15
garbeam@2 16 void
garbeam@2 17 error(char *errstr, ...) {
garbeam@2 18 va_list ap;
garbeam@2 19 va_start(ap, errstr);
garbeam@2 20 vfprintf(stderr, errstr, ap);
garbeam@2 21 va_end(ap);
garbeam@2 22 exit(1);
garbeam@2 23 }
garbeam@2 24
garbeam@3 25 static void
garbeam@3 26 bad_malloc(unsigned int size)
garbeam@3 27 {
garbeam@3 28 fprintf(stderr, "fatal: could not malloc() %d bytes\n",
garbeam@3 29 (int) size);
garbeam@3 30 exit(1);
garbeam@3 31 }
garbeam@3 32
garbeam@3 33 void *
garbeam@3 34 emallocz(unsigned int size)
garbeam@3 35 {
garbeam@3 36 void *res = calloc(1, size);
garbeam@3 37 if(!res)
garbeam@3 38 bad_malloc(size);
garbeam@3 39 return res;
garbeam@3 40 }
garbeam@3 41
garbeam@3 42 void *
garbeam@3 43 emalloc(unsigned int size)
garbeam@3 44 {
garbeam@3 45 void *res = malloc(size);
garbeam@3 46 if(!res)
garbeam@3 47 bad_malloc(size);
garbeam@3 48 return res;
garbeam@3 49 }
garbeam@3 50
garbeam@3 51 void *
garbeam@3 52 erealloc(void *ptr, unsigned int size)
garbeam@3 53 {
garbeam@3 54 void *res = realloc(ptr, size);
garbeam@3 55 if(!res)
garbeam@3 56 bad_malloc(size);
garbeam@3 57 return res;
garbeam@3 58 }
garbeam@3 59
garbeam@3 60 char *
garbeam@3 61 estrdup(const char *str)
garbeam@3 62 {
garbeam@3 63 void *res = strdup(str);
garbeam@3 64 if(!res)
garbeam@3 65 bad_malloc(strlen(str));
garbeam@3 66 return res;
garbeam@3 67 }
garbeam@3 68
garbeam@3 69 void
garbeam@3 70 failed_assert(char *a, char *file, int line)
garbeam@3 71 {
garbeam@3 72 fprintf(stderr, "Assertion \"%s\" failed at %s:%d\n", a, file, line);
garbeam@3 73 abort();
garbeam@3 74 }
garbeam@3 75
garbeam@3 76 void
garbeam@3 77 swap(void **p1, void **p2)
garbeam@3 78 {
garbeam@3 79 void *tmp = *p1;
garbeam@3 80 *p1 = *p2;
garbeam@3 81 *p2 = tmp;
garbeam@3 82 }
garbeam@5 83
garbeam@5 84 void
garbeam@14 85 spawn(Display *dpy, char *argv[])
garbeam@5 86 {
garbeam@14 87 if(!argv || !argv[0])
garbeam@5 88 return;
garbeam@5 89 if(fork() == 0) {
garbeam@5 90 if(fork() == 0) {
garbeam@5 91 if(dpy)
garbeam@5 92 close(ConnectionNumber(dpy));
garbeam@9 93 setsid();
garbeam@14 94 execvp(argv[0], argv);
garbeam@14 95 fprintf(stderr, "gridwm: execvp %s", argv[0]);
garbeam@5 96 perror(" failed");
garbeam@5 97 }
garbeam@5 98 exit (0);
garbeam@5 99 }
garbeam@5 100 wait(0);
garbeam@5 101 }
garbeam@6 102
garbeam@6 103 void
garbeam@14 104 pipe_spawn(char *buf, unsigned int len, Display *dpy, char *argv[])
garbeam@6 105 {
garbeam@6 106 unsigned int l, n;
garbeam@6 107 int pfd[2];
garbeam@6 108
garbeam@14 109 if(!argv || !argv[0])
garbeam@6 110 return;
garbeam@6 111
garbeam@6 112 if(pipe(pfd) == -1) {
garbeam@6 113 perror("pipe");
garbeam@6 114 exit(1);
garbeam@6 115 }
garbeam@6 116
garbeam@6 117 if(fork() == 0) {
garbeam@6 118 if(dpy)
garbeam@6 119 close(ConnectionNumber(dpy));
garbeam@9 120 setsid();
garbeam@6 121 dup2(pfd[1], STDOUT_FILENO);
garbeam@6 122 close(pfd[0]);
garbeam@6 123 close(pfd[1]);
garbeam@14 124 execvp(argv[0], argv);
garbeam@14 125 fprintf(stderr, "gridwm: execvp %s", argv[0]);
garbeam@6 126 perror(" failed");
garbeam@6 127 }
garbeam@6 128 else {
garbeam@6 129 n = 0;
garbeam@6 130 close(pfd[1]);
garbeam@6 131 while(l > n) {
garbeam@6 132 if((l = read(pfd[0], buf + n, len - n)) < 1)
garbeam@6 133 break;
garbeam@6 134 n += l;
garbeam@6 135 }
garbeam@6 136 close(pfd[0]);
garbeam@16 137 buf[n < len ? n : len - 1] = 0;
garbeam@6 138 }
garbeam@6 139 wait(0);
garbeam@6 140 }