Commit e88a2fc

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Add function to become daemon

Signed-off-by: Seungha Son <seungha.son@samsung.com>

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	`1`	`+#include <stdio.h>`
	`2`	`+#include <stdlib.h>`
	`3`	`+#include <unistd.h>`
	`4`	`+`
	`5`	`+#include <sys/stat.h>`
	`6`	`+#include <fcntl.h>`
	`7`	`+`
	`8`	`+static void make_child(void)`
	`9`	`+{`
	`10`	`+ switch (fork()) {`
	`11`	`+ case -1:`
	`12`	`+ exit(EXIT_FAILURE);`
	`13`	`+ case 0:`
	`14`	`+ break;`
	`15`	`+ default:`
	`16`	`+ exit(EXIT_SUCCESS);`
	`17`	`+ }`
	`18`	`+}`
	`19`	`+`
	`20`	`+void s_daemon_become(void)`
	`21`	`+{`
	`22`	`+ int ret;`
	`23`	`+ int fd;`
	`24`	`+ int max_fd;`
	`25`	`+`
	`26`	`+ make_child();`
	`27`	`+`
	`28`	`+ ret = setsid();`
	`29`	`+ if (ret == -1)`
	`30`	`+ exit(EXIT_FAILURE);`
	`31`	`+`
	`32`	`+ make_child();`
	`33`	`+`
	`34`	`+ umask(0);`
	`35`	`+`
	`36`	`+ ret = chdir("/");`
	`37`	`+ if (ret != 0)`
	`38`	`+ exit(EXIT_FAILURE);`
	`39`	`+`
	`40`	`+ max_fd = sysconf(_SC_OPEN_MAX);`
	`41`	`+ if (max_fd == -1)`
	`42`	`+ max_fd = 8192;`
	`43`	`+`
	`44`	`+ for (fd = 0; fd < max_fd; fd++)`
	`45`	`+ close(fd);`
	`46`	`+`
	`47`	`+ close(STDIN_FILENO);`
	`48`	`+`
	`49`	`+ fd = open("/dev/null", O_RDWR);`
	`50`	`+ if (fd != STDIN_FILENO)`
	`51`	`+ exit(EXIT_FAILURE);`
	`52`	`+ if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO)`
	`53`	`+ exit(EXIT_FAILURE);`
	`54`	`+ if (dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)`
	`55`	`+ exit(EXIT_FAILURE);`
	`56`	`+}`

Lines changed: 6 additions & 0 deletions

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